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  • Bang Notation and Dot Notation in VBA and MS-Access

    - by Nitrodist
    While perusing an application that I'm documenting, I've run across some examples of bang notation in accessing object properties/methods, etc. and in other places they use dot notation for what seems like the same purpose. Is there a difference or preference to using one or the other? Some simple googling only reveals limited information on the subject with some people actually using it in opposite cases. Perhaps there is a coding standards section from MS somewhere that indicates the method of madness?

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  • Infix vs Prefix Notation - Which do you prefer?

    - by Jetti
    I have been learning Clojure and looking at Scheme and CL which introduced me to the world of prefix notation. At first I didn't like it but it is still starting to grow on me. To be honest though, there are still long calculations that are difficult for me to understand but I think that is an issue of me needing more exposure/practice and I'll get it. But that leads me to the question: Which type of notation do you prefer and why?

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  • Convert scientific notation to decimal notation

    - by Ankur
    There is a similar question on SO which suggests using NumberFormat which is what I have done. I am using the parse() method of NumberFormat. public static void main(String[] args) throws ParseException{ DecToTime dtt = new DecToTime(); dtt.decToTime("1.930000000000E+02"); } public void decToTime(String angle) throws ParseException{ DecimalFormat dform = new DecimalFormat(); //ParsePosition pp = new ParsePosition(13); Number angleAsNumber = dform.parse(angle); System.out.println(angleAsNumber); } The result I get is 1.93 I didn't really expect this to work because 1.930000000000E+02 is a pretty unusual looking number, do I have to do some string parsing first to remove the zeros? Or is there a quick and elegant way?

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  • What scientific plotting software is available?

    - by Helix
    I am currently doing some experimental work and I have a lot of data to trawl though. I use Gnumeric, and it's very good, but often I feel there has to be something better. Ideally I would like the maximum number of features with a minimal learning curve, but really I'd just like to know if there is something better than Gnumeric that I can use for manipulating and plotting data. What would you recommend?

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  • compact Number formatting behavior in Java (automatically switch between decimal and scientific notation)

    - by kostmo
    I am looking for a way to format a floating point number dynamically in either standard decimal format or scientific notation, depending on the value of the number. For moderate magnitudes, the number should be formatted as a decimal with trailing zeros suppressed. If the floating point number is equal to an integral value, the decimal point should also be suppressed. For extreme magnitudes (very small or very large), the number should be expressed in scientific notation. Alternately stated, if the number of characters in the expression as standard decimal notation exceeds a certain threshold, switch to scientific notation. I should have control over the maximum number of digits of precision, but I don't want trailing zeros appended to express the minimum precision; all trailing zeros should be suppressed. Basically, it should optimize for compactness and readability. 2.80000 - 2.8 765.000000 - 765 0.0073943162953 - 0.00739432 (limit digits of precision—to 6 in this case) 0.0000073943162953 - 7.39432E-6 (switch to scientific notation if the magnitude is small enough—less than 1E-5 in this case) 7394316295300000 - 7.39432E+6 (switch to scientific notation if the magnitude is large enough—for example, when greater than 1E+10) 0.0000073900000000 - 7.39E-6 (strip trailing zeros from significand in scientific notation) 0.000007299998344 - 7.3E-6 (rounding from the 6-digit precision limit causes this number to have trailing zeros which are stripped) Here's what I've found so far: The .toString() method of the Number class does most of what I want, except it doesn't upconvert to integer representation when possible, and it will not express large integral magnitudes in scientific notation. Also, I'm not sure how to adjust the precision. The "%G" format string to the String.format(...) function allows me to express numbers in scientific notation with adjustable precision, but does not strip trailing zeros. I'm wondering if there's already some library function out there that meets these criteria. I guess the only stumbling block for writing this myself is having to strip the trailing zeros from the significand in scientific notation produced by %G.

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  • Big Oh notation does not mention constant value

    - by user883561
    I am a programmer and have just started reading Algorithms. I am not completely convinced with the notations namely Bog Oh, Big Omega and Big Theta. The reason is by definition of Big Oh, it states that there should be a function g(x) such that it is always greater than or equal to f(x). Or f(x) <= c.n for all values of n n0. My doubt is the why dont we mention the constant value in the definition? For example. lets say a function 6n+4, we denote it as O(n). but its not true that the definition holds good for all constant value. this holds good only when c = 10 and n = 1. For lesser values of c than 6, the value of n0 increases. So why we do not mention the constant value as a part of the definition.

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  • Configuration management in support of scientific computing

    - by Sharpie
    For the past few years I have been involved with developing and maintaining a system for forecasting near-shore waves. Our team has just received a significant grant for further development and as a result we are taking the opportunity to refactor many components of the old system. We will also be receiving a new server to run the model and so I am taking this opportunity to consider how we set up the system. Basically, the steps that need to happen are: Some standard packages and libraries such as compilers and databases need to be downloaded and installed. Some custom scientific models need to be downloaded and compiled from source as they are not commonly provided as packages. New users need to be created to manage the databases and run the models. A suite of scripts that manage model-database interaction needs to be checked out from source code control and installed. Crontabs need to be set up to run the scripts at regular intervals in order to generate forecasts. I have been pondering applying tools such as Puppet, Capistrano or Fabric to automate the above steps. It seems perfectly possible to implement most of the above functionality except there are a couple usage cases that I am wondering about: During my preliminary research, I have found few examples and little discussion on how to use these systems to abstract and automate the process of building custom components from source. We may have to deploy on machines that are isolated from the Internet- i.e. all configuration and set up files will have to come in on a USB key that can be inserted into a terminal that can connect to the server that will run the models. I see this as an opportunity to learn a new tool that will help me automate my workflow, but I am unsure which tool I should start with. If any member of the community could suggest a tool that would support the above workflow and the issues specific to scientific computing, I would be very grateful. Our production server will be running Linux, but support for OS X would be a bonus as it would allow the development team to setup test installations outside of VirtualBox.

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  • Configuration management in support of scientific computing

    - by Sharpie
    For the past few years I have been involved with developing and maintaining a system for forecasting near-shore waves. Our team has just received a significant grant for further development and as a result we are taking the opportunity to refactor many components of the old system. We will also be receiving a new server to run the model and so I am taking this opportunity to consider how we set up the system. Basically, the steps that need to happen are: Some standard packages and libraries such as compilers and databases need to be downloaded and installed. Some custom scientific models need to be downloaded and compiled from source as they are not commonly provided as packages. New users need to be created to manage the databases and run the models. A suite of scripts that manage model-database interaction needs to be checked out from source code control and installed. Crontabs need to be set up to run the scripts at regular intervals in order to generate forecasts. I have been pondering applying tools such as Puppet, Capistrano or Fabric to automate the above steps. It seems perfectly possible to implement most of the above functionality except there are a couple usage cases that I am wondering about: During my preliminary research, I have found few examples and little discussion on how to use these systems to abstract and automate the process of building custom components from source. We may have to deploy on machines that are isolated from the Internet- i.e. all configuration and set up files will have to come in on a USB key that can be inserted into a terminal that can connect to the server that will run the models. I see this as an opportunity to learn a new tool that will help me automate my workflow, but I am unsure which tool I should start with. If any member of the community could suggest a tool that would support the above workflow and the issues specific to scientific computing, I would be very grateful. Our production server will be running Linux, but support for OS X would be a bonus as it would allow the development team to setup test installations outside of VirtualBox.

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  • Changing file browser in Scientific Linux

    - by karolg
    I use Scientific Linux Release 6.1 (Carbon) with GNOME 2.28.2. When I double-click on a folder on the Desktop it is opened in "File Browser". When I open a folder via "Places" on the Main Menu Bar, the folder is opened in "File Manager". I dislike "File Manager" and I don't understand why there are two different programs (file managers) running depending on how I open a folder. How can I get rid of "File Manager"?

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  • Scientific Linux - mysql and apachefail to start on reboot

    - by Derek Deed
    Both mysqld and httpd fail to restart following a reboot of the server, although chkconfig --list shows both daemons set to on for run levels 2,3,4 & 5 All control is being exectuted via Webmin Reboot server – MySQl and Apache not running MySQL Database Server MySQL version 5.1.69 MySQL is not running on your system - database list could not be retrieved. Click this button to start the MySQL database server on your system with the command /etc/rc.d/init.d/mysqld start. This Webmin module cannot administer the database until it is started. Apache Webserver Apache version 2.2.15 Start Apache Search Docs.. Global configuration Existing virtual hosts Create virtual host Select all. | Invert selection. Default Server Defines the default settings for all other virtual servers, and processes any unhandled requests. Address Any Port Any Server Name Automatic Document Root /var/www/drupal Virtual Server Processes all requests on port 443 not handled by other virtual servers. Address Any Port 443 Server Name Automatic Document Root /var/www/drupal Select all. | Invert selection. chkconfig --list mysqld mysqld 0:off 1:off 2:on 3:on 4:on 5:on 6:off chkconfig --list httpd httpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off Manually Restart Apache chkconfig --list httpd httpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off Manually Restart MySQL chkconfig --list mysqld mysqld 0:off 1:off 2:on 3:on 4:on 5:on 6:off Everything now running okay; but no difference in the chkconfig outputs above. Set chkconfig --levels 235 httpd on /etc/init.d/httpd start The same for mysqld but no change in operation. Log files show that the shutdown has been completed successfully; but there is no indication of the service restarting until it is executed manually: 131112 13:59:15 InnoDB: Starting shutdown... 131112 13:59:16 InnoDB: Shutdown completed; log sequence number 0 881747021 131112 13:59:16 [Note] /usr/libexec/mysqld: Shutdown complete 131112 13:59:16 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended 131112 14:09:52 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 131112 14:09:52 InnoDB: Initializing buffer pool, size = 8.0M 131112 14:09:52 InnoDB: Completed initialization of buffer pool [Tue Nov 12 13:59:13 2013] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec) [Tue Nov 12 13:59:13 2013] [notice] Digest: generating secret for digest authentication ... [Tue Nov 12 13:59:13 2013] [notice] Digest: done [Tue Nov 12 13:59:14 2013] [notice] Apache/2.2.15 (Unix) DAV/2 PHP/5.3.3 mod_ssl/2.2.15 OpenSSL/1.0.0-fips configured -- resuming normal operations [Tue Nov 12 13:59:14 2013] [notice] caught SIGTERM, shutting down [Tue Nov 12 14:27:13 2013] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec) [Tue Nov 12 14:27:13 2013] [notice] Digest: generating secret for digest authentication ... [Tue Nov 12 14:27:13 2013] [notice] Digest: done [Tue Nov 12 14:27:13 2013] [notice] Apache/2.2.15 (Unix) DAV/2 PHP/5.3.3 mod_ssl/2.2.15 OpenSSL/1.0.0-fips configured -- resuming normal operations Is anyone able to shed any light on this problem, Cheers, Derek.

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  • Scientific Linux - mysql and apache fail to start on reboot

    - by Derek Deed
    Both mysqld and httpd fail to restart following a reboot of the server, although chkconfig --list shows both daemons set to on for run levels 2,3,4 & 5 All control is being exectuted via Webmin Reboot server – MySQl and Apache not running MySQL Database Server MySQL version 5.1.69 MySQL is not running on your system - database list could not be retrieved. ________________________________________ Click this button to start the MySQL database server on your system with the command /etc/rc.d/init.d/mysqld start. This Webmin module cannot administer the database until it is started. Apache Webserver Apache version 2.2.15 Start Apache Search Docs.. Global configuration Existing virtual hosts Create virtual host Select all. | Invert selection. Default Server Defines the default settings for all other virtual servers, and processes any unhandled requests. Address Any Port Any Server Name Automatic Document Root /var/www/drupal Virtual Server Processes all requests on port 443 not handled by other virtual servers. Address Any Port 443 Server Name Automatic Document Root /var/www/drupal Select all. | Invert selection. chkconfig --list mysqld mysqld 0:off 1:off 2:on 3:on 4:on 5:on 6:off chkconfig --list httpd httpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off Manually Restart Apache chkconfig --list httpd httpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off Manually Restart MySQL chkconfig --list mysqld mysqld 0:off 1:off 2:on 3:on 4:on 5:on 6:off Everything now running okay; but no difference in the chkconfig outputs above. I tried: chkconfig --levels 235 httpd on /etc/init.d/httpd start and the same for mysqld but no change in operation. Log files show that the shutdown has been completed successfully; but there is no indication of the service restarting until it is executed manually: 131112 13:59:15 InnoDB: Starting shutdown... 131112 13:59:16 InnoDB: Shutdown completed; log sequence number 0 881747021 131112 13:59:16 [Note] /usr/libexec/mysqld: Shutdown complete 131112 13:59:16 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended 131112 14:09:52 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 131112 14:09:52 InnoDB: Initializing buffer pool, size = 8.0M 131112 14:09:52 InnoDB: Completed initialization of buffer pool And the Apache logs: [Tue Nov 12 13:59:13 2013] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec) [Tue Nov 12 13:59:13 2013] [notice] Digest: generating secret for digest authentication ... [Tue Nov 12 13:59:13 2013] [notice] Digest: done [Tue Nov 12 13:59:14 2013] [notice] Apache/2.2.15 (Unix) DAV/2 PHP/5.3.3 mod_ssl/2.2.15 OpenSSL/1.0.0-fips configured -- resuming normal operations [Tue Nov 12 13:59:14 2013] [notice] caught SIGTERM, shutting down [Tue Nov 12 14:27:13 2013] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec) [Tue Nov 12 14:27:13 2013] [notice] Digest: generating secret for digest authentication ... [Tue Nov 12 14:27:13 2013] [notice] Digest: done [Tue Nov 12 14:27:13 2013] [notice] Apache/2.2.15 (Unix) DAV/2 PHP/5.3.3 mod_ssl/2.2.15 OpenSSL/1.0.0-fips configured -- resuming normal operations Is anyone able to shed any light on this problem?

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  • Javascript Regex to convert dot notation to bracket notation

    - by Tauren
    Consider this javascript: var joe = { name: "Joe Smith", location: { city: "Los Angeles", state: "California" } } var string = "{name} is currently in {location.city}, {location.state}"; var out = string.replace(/{([\w\.]+)}/g, function(wholematch,firstmatch) { return typeof values[firstmatch] !== 'undefined' ? values[firstmatch] : wholematch; }); This will output the following: Joe Smith is currently in {location.city}, {location.state} But I want to output the following: Joe Smith is currently in Los Angeles, California I'm looking for a good way to convert multiple levels of dot notation found between braces in the string into multiple parameters to be used with bracket notation, like this: values[first][second][third][etc] Essentially, for this example, I'm trying to figure out what regex string and function I would need to end up with the equivalent of: out = values[name] + " is currently in " + values["location"]["city"] + values["location"]["state"];

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  • Split vector vs matrix notation for transformation

    - by seahorse
    Some rendering engines like Ogre prefer to use a individual vector based notation for transformations like the following Split vector notation: Net Transformation is represented by Scale vector = sx, sy, sz Transformation vector = tx, ty, tz Rotation Quaternion Vector = w,x,y,z Matrix notation: There are other engines which simply use a net combined transformation matrix. What are the advantages of the first notation over the second? Also for animation interpolation does it work in the first notation that we interpolate across the individual components and use the interpolated parts to get the net transformation? Is this another advantage?

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  • F# performance in scientific computing

    - by aaa
    hello. I am curious as to how F# performance compares to C++ performance? I asked a similar question with regards to Java, and the impression I got was that Java is not suitable for heavy numbercrunching. I have read that F# is supposed to be more scalable and more performant, but how is this real-world performance compares to C++? specific questions about current implementation are: How well does it do floating-point? Does it allow vector instructions how friendly is it towards optimizing compilers? How big a memory foot print does it have? Does it allow fine-grained control over memory locality? does it have capacity for distributed memory processors, for example Cray? what features does it have that may be of interest to computational science where heavy number processing is involved? Are there actual scientific computing implementations that use it? Thanks

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  • Managed language for scientific computing software

    - by heisen
    Scientific computing is algorithm intensive and can also be data intensive. It often needs to use a lot of memory to run analysis and release it before continuing with the next. Sometime it also uses memory pool to recycle memory for each analysis. Managed language is interesting here because it can allow the developer to concentrate on the application logic. Since it might need to deal with huge dataset, performance is important too. But how can we control memory and performance with managed language?

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  • Reading ASCII numbers using "D" instead of "E" for scientific notation using C

    - by Arrieta
    Hello, I have a list of numbers which looks like this: 1.234D+1 or 1.234D-02. I want to read the file using C. The function atof will merely ignore the D and translate only the mantissa. The function fscanf will not accept the format '%10.6e' because it expects an E instead of a D in the exponent. When I ran into this problem in Python, I have up and merely used a string substitution before converting from string to float. But in C, I am sure there must be another way. So, how would you read a file with numbers using D instead of E for scientific notation? Notice that I do not mean how to read the strings themselves, but rather how to convert them to floats. Thanks.

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  • Greek/latin scientific JLabel in Java Swing application

    - by MartinStettner
    For a scientific application I want to design an input form which lets the user enter certain parameters. Some of them are designated using greek letters, some of them have latin letters. The parameter names should be displayed using ordinary JLabel controls. On Windows, the Tahoma font (which is used for Labels by default) contains both latin and greek letters, so I simply set the Text property of the label to a greek (unicode) string and everything works fine. I'm wondering if this works also without modifications on Linux and OSX systems resp. for which Java/OS versions this would work. Also I'm curious if there's an easy way to show subscripts in labels ("\eta_0" in TeX), but this is not that important for my application ...

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  • jqGrid Sort or Search does not work with columns having json dot notation

    - by rsmoorthy
    I have this jqGrid: $("#report").jqGrid( { url: '/py/db?coll=report', datatype: 'json', height: 250, colNames: ['ACN', 'Status', 'Amount'], colModel: [ {name:'acn', sortable:true}, {name:'meta.status', sortable:true}, {name:amount} ], caption: 'Show Report', rownumbers: true, gridview: true, rowNum: 10, rowList: [10,20,30], pager: '#report_pager', viewrecords: true, sortname: 'acn', sortorder: "desc", altRows: true, loadonce: true, mtype: "GET", rowTotal: 1000, jsonReader: { root: "rows", page: "page", total: "total", records: "records", repeatitems: false, id: "acn" } }); Notice that the column 'meta.status' is in JSON dot notation and accordingly the data sent from the server is like this: {"page": "1", "total": "1", "records": "5", "rows": [ {"acn":1,"meta": {"status":"Confirmed"}, "amount": 50}, {"acn":2,"meta": {"status":"Started"}, "amount": 51}, {"acn":3,"meta": {"status":"Stopped"}, "amount": 52}, {"acn":4,"meta": {"status":"Working"}, "amount": 53}, {"acn":5,"meta": {"status":"Started"}, "amount": 54} ] } The problems are of two fold: Sorting does not work on columns with dot notation, here "meta.status". It does not even show the sortable icons on the column header, and nothing happens even if the header is clicked. Sorting does not work, whether loadonce is true or false. If I try Searching (after setting loadonce to true) for the column meta.status (other columns without dot notation is okay), then it throws up a javascript error like this. Any help? Thanks Moorthy

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  • Industry-style practices for increasing productivity in a small scientific environment

    - by drachenfels
    Hi, I work in a small, independent scientific lab in a university in the United States, and it has come to my notice that, compared with a lot of practices that are ostensibly followed in the industry, like daily checkout into a version control system, use of a single IDE/editor for all languages (like emacs), etc, we follow rather shoddy programming practices. So, I was thinking of getting together all my programs, scripts, etc, and building a streamlined environment to increase productivity. I'd like suggestions from people on Stack Overflow for the same. Here is my primary plan.: I use MATLAB, C and Python scripts, and I'd like to edit, compile them from a single editor, and ensure correct version control. (questions/things for which I'd like suggestions are in italics) 1] Install Cygwin, and get it to work well with Windows so I can use git or a similar version control system (is there a DVCS which can work directly from the windows CLI, so I can skip the Cygwin step?). 2] Set up emacs to work with C, Python, and MATLAB files, so I can edit and compile all three at once from a single editor (say, emacs) (I'm not very familiar with the emacs menu, but is there a way to set the path to the compiler for certain languages? I know I can Google this, but emacs documentation has proved very hard for me to read so far, so I'd appreciate it if someone told me in simple language) 3] Start checking in code at the end of each day or half-day so as to maintain a proper path of progress of my code (two questions), can you checkout files directly from emacs? is there a way to checkout LabVIEW files into a DVCS like git? Lastly, I'd like to apologize for the rather vague nature of the question, and hope I shall learn to ask better questions over time. I'd appreciate it if people gave their suggestions, though, and point to any resources which may help me learn.

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