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  • Fastest way to find the largest power of 10 smaller than x

    - by peoro
    Is there any fast way to find the largest power of 10 smaller than a given number? I'm using this algorithm, at the moment, but something inside myself dies anytime I see it: 10**( int( math.log10(x) ) ) # python pow( 10, (int) log10(x) ) // C I could implement simple log10 and pow functions for my problems with one loop each, but still I'm wondering if there is some bit magic for decimal numbers.

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  • How to access CRM 4.0 settings programmatically?

    - by Shaamaan
    Some of the plugins I wrote (re)calculate various prices, and I used Math.Round to keep results accurate with the default 2 digit setting in CRM. But I figured... what if a user decides to set his CRM to use a different precision? So, I need to access the CRM settings programmatically, so that my functions can work with whatever setting the user chooses. How would I go about accessing the General (and, possibly, other) CRM settings from my code?

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  • How to calculate the latlng of a point a certain distance away from another?

    - by Rene Saarsoo
    To draw a circle on map I have a center GLatLng (A) and a radius (r) in meters. Here's a diagram: ----------- --/ \-- -/ \- / \ / \ / r \ | *-------------* \ A / B \ / \ / -\ /- --\ /-- ----------- How to calculate the GLatLng at position B? Assuming that r is parallel to the equator. Getting the radius when A and B is given is trivial using the GLatLng.distanceFrom() method - but doing it the other way around not so. Seems that I need to do some heavier math.

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  • LaTeX: Unnumbered section in header of document

    - by Soren M
    I have a document where I want to place an unnumbered section in my header. I use the fancyhdr package, and for a numbered section, I would had done something like this: \lhead{\leftmark} But this don't work with unnumbered sections. I'm solving math-problems in my document, so I don't want part-sections and numbered sections Anyone, who knows, how this is done?

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  • Putting newline in matplotlib label with TeX in Python?

    - by user248237
    How can I add a newline to a plot's label (e.g. xlabel or ylabel) in Matplotlib? For example, plt.bar([1, 2], [4, 5]) plt.xlabel("My x label") plt.ylabel(r"My long label with $\Sigma_{C}$ math \n continues here") Ideally i'd like the y-labeled to be centered too. Is there a way to do this? It's important that the label have both tex (enclosed in '$') and the newline. thanks.

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  • effective functonal sort

    - by sreservoir
    I'm programming a function for a ti-nspire, so I can't use the builtins from inside a function. what is the most generally efficient algorithm for sorting a list of numbers without modifying the list itself? (recursion and list-splitting are fair game, as is general use of math.)

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  • LaTeX vs DocBook

    - by yfel
    I have only little knowledge about LaTeX, basic formatting, basic math fomulae etc.. I found that LaTeX is hard to configure to my own flavor. Recently, I've heard about Docbook, which is also a typesetting mechanism, but much easier since it uses XML. So, if my main job using LaTeX/Docbook is writing a simple document (not a class book) with some mathematics, and I want easy configuration, and a highly constomizable application, which one is better, and is there any good book on Docbook?

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  • What is the perfect skill set for a software engineer? [closed]

    - by Sergey
    Of course, except technology stack. I'm asking about more fundamental skills such as design patterns or math. POSSIBLE DUPLICATES: http://stackoverflow.com/questions/76364/what-is-the-single-most-effective-thing-you-did-to-improve-your-programming-skill http://stackoverflow.com/questions/132798/what-should-every-programmer-know http://stackoverflow.com/questions/1177724/what-soft-skills-make-a-great-programmer

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  • How to "grep" out specific lline ranges of a file

    - by Mike
    There are often times I'll grep -l whatev file to find what I'm looking for. Say the output is 1234: whatev 1 5555: whatev 2 6643: whatev 3 If I want to then just extract the lines between 1234 and 5555, is there a tool to do that? For static files I have a script that does wc -l of the file and then does the math to split it out with tail & head but that doesn't work out so well with log files that are constantly being written to.

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  • Python Pandas operate on row

    - by wuha
    Hi my dataframe look like: Store,Dept,Date,Sales 1,1,2010-02-05,245 1,1,2010-02-12,449 1,1,2010-02-19,455 1,1,2010-02-26,154 1,1,2010-03-05,29 1,1,2010-03-12,239 1,1,2010-03-19,264 Simply, I need to add another column called '_id' as concatenation of Store, Dept, Date like "1_1_2010-02-05", I assume I can do it through df['id'] = df['Store'] +'' +df['Dept'] +'_'+df['Date'], but it turned out to be not. Similarly, i also need to add a new column as log of sales, I tried df['logSales'] = math.log(df['Sales']), again, it did not work.

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  • How to calculate a latlng on google map ceartain distance away from another?

    - by Rene Saarsoo
    To draw a circle on map I have a center GLatLng (A) and a radius (r) in meters. Here's a diagram: ----------- --/ \-- -/ \- / \ / \ / r \ | *-------------* \ A / B \ / \ / -\ /- --\ /-- ----------- How to calculate the GLatLng at position B? Assuming that r is parallel to the equator. Getting the radius when A and B is given is trivial using the GLatLng.distanceFrom() method - but doing it the other way around not so. Seems that I need to do some heavier math.

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  • Lua choose random item from table

    - by Zen
    Seems easy but I just don't get any further: Take this example: local myTable = { 'a', 'b', 'c', 'd' } print( myTable[ math.random( 0, #myTable - 1 ) ] ) Why doesn't it work? Google seems to have no answers on this either

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  • matrices&searching [closed]

    - by gcc
    question 1) between different characters&real numbers , finding specific one how could i do question 2) myfriend asked me a good question : can we divide two matrices to each other // in math , we havenot learned but maybe someone knows where we find the answer

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  • How to access the elements in <script> inside the body tag

    - by Geetha
    Hi All, I am using <script> inside the body tag. <script type="text/javascript" language="javascript"> $('#audioVolume').text($('#audioVolume').text(Math.round((document.mediaPlayer.Volume + 2000) / 10) + "%")); </script> Error: Microsoft JScript runtime error: 'undefined' is null or not an object. Need: I want to access the html elements in <script inside the body tag.

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  • C++ open source projects

    - by Chaoz
    Hello, I'm looking for a suitable open source project to work on in C++. It really can be anything. My background is in gaming, on both PC and consoles; but I'd prefer to work on something low latency or real time. I'm also interested in Math stuff. Do any of you guys have suggestions?

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  • Scaling textSize in a TextView

    - by fiXedd
    Say I have a TextView of a particular size (doesn't really matter what... fill_parent, 20dip, whatever). Is it possible to tell the text to shrink/grow in size to fit the available space without doing a lot of math?

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  • round() for float in C++

    - by Roddy
    I need a simple floating point rounding function, thus: double round(double); round(0.1) = 0 round(-0.1) = 0 round(-0.9) = -1 I can find ceil() and floor() in the math.h - but not round(). Is it present in the standard C++ library under another name, or is it missing??

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  • How to convert from base-256 to base-N, where N is higher than 16?

    - by mark
    Dear ladies and sirs. I need to convert an array of bytes to another base, namely 85. In math terms the question is how to convert from base-256 to base-85 in the most efficient way? This question is inspired by my previous question - http://stackoverflow.com/questions/2827627/what-is-the-most-efficient-way-to-encode-an-arbitrary-guid-into-readable-ascii-3 Thanks.

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  • returning aligned memory with new?

    - by Steve
    I currently allocate my memory for arrays using the MS specific mm_malloc. I align the memory, as I'm doing some heavy duty math and the vectorization takes advantage of the alignment. I was wondering if anyone knows how to overload the new operator to do the same thing, as I feel dirty malloc'ing everywhere (and would eventually like to also compile on Linux)? Thanks for any help

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  • How to figure out if two CGRect intersect?

    - by mystify
    In -drawRect: I want to check if the provided rect intersects with anotherRect. I'm not good at this geometry math stuff and especially at english so what I want to say is: If you have two sheets of paper on the desk, and one of them covers the other either completely or just a small portion, it is rectsIntersect = YES. How to check that out for rect and anotherRect?

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  • Computing e^(-j) in C..

    - by Erkan H
    I need to compute imaginary exponential in C. As far as I know, there is no complex number library in C. It is possible to get e^x with exp(x) of math.h, but how can I compute the value of e^(-j), where j = sqrt(-1)?

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  • C# float to decimal conversion

    - by Adrian4B
    Any smart way to convert a float like this: float f = 711989.98f; into a decimal (or double) without loosing precision? I've tried: decimal d = (decimal)f; decimal d1 = (decimal)(Math.Round(f,2)); decimal d2 = Convert.ToDecimal(f);

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