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  • Extract data from uint8 to double

    - by HADJ AMOR HASSEN
    I have a C function receiving a uint8 pointer with another parameter which is its size (number of bytes). I want to extract double data from this buffer. Here is my code: Write(uint8* data, uint8 size) /* data and size are given by a callback to my function)*/ { double d; for (i = 0; i < size; i++) { d = ((double*)&data)[i]; printf(" d = %d\n"); } } The problem is that I am not receiving what I am sending within an external hardware. I guess that my cast is wrong. I tried other methods but without any good result. I am still not able to get what I send.

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  • Splitting a double in two, C#

    - by Stacey
    I'm attempting to use a double to represent a bit of a dual-value type in a database that must sometimes accept two values, and sometimes accept only one (int). So the field is a float in the database, and in my C# code, it is a double (since mapping it via EF makes it a double for some reason... ) So basically what I want to do .. let's say 2.5 is the value. I want to separate that out into 2, and 5. Is there any implicit way to go about this?

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  • dynamically double image size

    - by Edan Duarte
    I have an embarrassingly simple question: How can I display an image at double its size without hard coding the width and height attributes? Here's what I tried, but I ended up having to just enter 1000 for width and height. Is something wrong with my function? Thanks! <img onload="double(self.id);" name="bigPic" id="bigPic" src="album1.jpg" height="1000" width="1000"/> function double(id) { var img = document.getElementById(id); var dblWdth = img.width * 2; var dblHt = img.height * 2; img.height = dblHt; img.width = dblWdth; }

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  • Graphics card initialisation problems when booting - requires a "double" boot

    - by DMA57361
    Problem Outline When booting from cold (and my machine is disconnected from main power when off, but leaving it connected doesn't help) the graphics card (single PCI-e card GeForce 460) will not initialise on the first boot, leaving me with the motherboards on-board graphics (which kick in automatically if no PCI-e card is found). However, if I restart the computer - normally I do this by powering it off just after the numlock lights up on the keyboard (ie, just after POST/BIOS and before Windows takes over), wait for the system to whirr down, and power up again - the graphics card will work correctly. Once double-booted in this matter the system seems to work correctly - with no noticeable problems. This is reproducible every time I try to boot - it has been working like this for about a month now. Background Information Sept 2010 - I suffered a hardware malfunction (crashes in Windows and graphics corruption on BIOS screens). By way of spare hardware I determined that replacing the PSU removed the issue, so I replaced the PSU with a brand new one of slightly higher power (460W replaced with 500W). Oct 2010 - The problem resurfaced. I purchased a new graphics card (GeForce 460), which removed the problem. The new graphics card immediately started having the boot initialisation problems mentioned. I presumed there was a motherboard fault all along, but because the system worked once booted, and I was temporarily out of spare money, I left the system alone and continued to use it. Early/Mid Dec 2010 - In the space of 5 days I recieved 3 instances of hard drive corruption (seemlingly fixed by chkdsk and sfc in each case...). Since I was already under the impression the motherboard was faulty, I purchased a new one ASAP, this also required new RAM (as I dropped from 4 slots to 2 and didn't want to drop mem quantity). Past 3-4 weeks - With a brand new PSU, Graphics Card, Motherboard and RAM I'm suffering the problem outlined above. So, what could be causing this and how do I can resolve it? Additional Notes Once double-booted the system seems to work entirely correctly. The graphics card problem has occured on two entirely different motherboards. I do not have the opportunity to test the graphics card in a different computer (I've only the old motherboard, which is dubious, or a really old desktop that still has an AGP port). Under load (ie, modern games for long enough for temperatures to plateau) the system remains stable and performs as expected. The software that came with the new motherboard and SpeenFan both report all voltages and temperatures are within nominal bounds, when idle and when under load. I've looking over the BIOS settings for my motherboard multiple times and can find nothing that helps. This system is configured to run with everything at standard levels - no overclocking. I've tried booting the system with only the mobo and graphics card connected (thinking maybe my new PSU was too weak for the new gfx card, even though it meets the quoted PSU requirements for the card) but the same problem persists (and really if the PSU was weak I'd have problems with the system under load). When the gfx card does not initialise the fan on its cooling unit is running, possibly slower than otherwise - but this measurement is by eye and so unreliable.

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  • Find max integer size that a floating point type can handle without loss of precision

    - by Checkers
    Double has range more than a 64-bit integer, but its precision is less dues to its representation (since double is 64-bit as well, it can't fit more actual values). So, when representing larger integers, you start to lose precision in the integer part. #include <boost/cstdint.hpp> #include <limits> template<typename T, typename TFloat> void maxint_to_double() { T i = std::numeric_limits<T>::max(); TFloat d = i; std::cout << std::fixed << i << std::endl << d << std::endl; } int main() { maxint_to_double<int, double>(); maxint_to_double<boost::intmax_t, double>(); maxint_to_double<int, float>(); return 0; } This prints: 2147483647 2147483647.000000 9223372036854775807 9223372036854775800.000000 2147483647 2147483648.000000 Note how max int can fit into a double without loss of precision and boost::intmax_t (64-bit in this case) cannot. float can't even hold an int. Now, the question: is there a way in C++ to check if the entire range of a given integer type can fit into a loating point type without loss of precision? Preferably, it would be a compile-time check that can be used in a static assertion, and would not involve enumerating the constants the compiler should know or can compute.

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  • Round-twice error in .NET's Double.ToString method

    - by Jeppe Stig Nielsen
    Mathematically, consider for this question the rational number 8725724278030350 / 2**48 where ** in the denominator denotes exponentiation, i.e. the denominator is 2 to the 48th power. (The fraction is not in lowest terms, reducible by 2.) This number is exactly representable as a System.Double. Its decimal expansion is 31.0000000000000'49'73799150320701301097869873046875 (exact) where the apostrophes do not represent missing digits but merely mark the boudaries where rounding to 15 resp. 17 digits is to be performed. Note the following: If this number is rounded to 15 digits, the result will be 31 (followed by thirteen 0s) because the next digits (49...) begin with a 4 (meaning round down). But if the number is first rounded to 17 digits and then rounded to 15 digits, the result could be 31.0000000000001. This is because the first rounding rounds up by increasing the 49... digits to 50 (terminates) (next digits were 73...), and the second rounding might then round up again (when the midpoint-rounding rule says "round away from zero"). (There are many more numbers with the above characteristics, of course.) Now, it turns out that .NET's standard string representation of this number is "31.0000000000001". The question: Isn't this a bug? By standard string representation we mean the String produced by the parameterles Double.ToString() instance method which is of course identical to what is produced by ToString("G"). An interesting thing to note is that if you cast the above number to System.Decimal then you get a decimal that is 31 exactly! See this Stack Overflow question for a discussion of the surprising fact that casting a Double to Decimal involves first rounding to 15 digits. This means that casting to Decimal makes a correct round to 15 digits, whereas calling ToSting() makes an incorrect one. To sum up, we have a floating-point number that, when output to the user, is 31.0000000000001, but when converted to Decimal (where 29 digits are available), becomes 31 exactly. This is unfortunate. Here's some C# code for you to verify the problem: static void Main() { const double evil = 31.0000000000000497; string exactString = DoubleConverter.ToExactString(evil); // Jon Skeet, http://csharpindepth.com/Articles/General/FloatingPoint.aspx Console.WriteLine("Exact value (Jon Skeet): {0}", exactString); // writes 31.00000000000004973799150320701301097869873046875 Console.WriteLine("General format (G): {0}", evil); // writes 31.0000000000001 Console.WriteLine("Round-trip format (R): {0:R}", evil); // writes 31.00000000000005 Console.WriteLine(); Console.WriteLine("Binary repr.: {0}", String.Join(", ", BitConverter.GetBytes(evil).Select(b => "0x" + b.ToString("X2")))); Console.WriteLine(); decimal converted = (decimal)evil; Console.WriteLine("Decimal version: {0}", converted); // writes 31 decimal preciseDecimal = decimal.Parse(exactString, CultureInfo.InvariantCulture); Console.WriteLine("Better decimal: {0}", preciseDecimal); // writes 31.000000000000049737991503207 } The above code uses Skeet's ToExactString method. If you don't want to use his stuff (can be found through the URL), just delete the code lines above dependent on exactString. You can still see how the Double in question (evil) is rounded and cast.

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  • Auto-responder rule in Outlook 2010 produces double signature (but only to certain emails)

    - by Austin ''Danger'' Powers
    I have set up an auto-responder in Outlook 2010 using a custom template, as a staff member will be on vacation for 6 weeks. It works perfectly, apart from the fact certain people receive two signatures at the bottom of the message instead of one. When reviewing the "sent" folder, there is no sign of double signatures. In the custom template, there is only 1 copy of the signature. Signatures are set to be applied automatically to new messages or replies- however, if I remove the signature from the template, then it seems no one receives a response with the signature. People sending from Hotmail accounts do not receive a duplicate signature. Gmail users do see a duplicate signature. Does anyone have any idea what could be causing this?

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  • Mouse(s) double clicks instead of single click (its not the mouse)

    - by Iznogood
    I am aware of this very similar question: But I have tried with 3 different mouses and everyone of them exibit the same behavior. Simple enough, 1 out of 3 times I get a double click when single clicking). I searched the net a lot about this problem and have yet to find a solution. I have tried: 1- switch to another mouse 2- uninstall the mouse drivers + reboot 3- I do not have any special mouse drivers/software like intellisense and logitecs to uninstall. 4- verified that I was not in fact on some setting that says open files with single click. 5- everything is up to date including a antivirus 6- Installed fresh drivers from dell's website It is a dell vostro 260 computer running windows 7 pro 64. edit: added a 6th thing I tried. edit2: tried reinstalling every windows update I could find nothing Boss just said he'd buy me a logitech mouse hoping the drivers will fix my problems. Hopefuly!

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  • Script or Utility to convert .nab to .csv without importing double entries in Outlook

    - by Chris
    Currently our environment is migrating from Groupwise 7 to Outlook 2003 and we have multiple users with mission critical outside contacts in their frequent contacts that will have to be imported in Outlook. Currently our only solution is to export GW contacts to a .nab, import to excel to scrub out the contacts in our own domain (to avoid double entry) and convert to .csv. This current solution will require a lot of man hours for hand holding because most of our users are not technically savvy AT ALL and are frankly too busy to do this themselves. Anyone know of any kind of tool or script to assist with this?

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  • If I double my ram on a x86 processor, does that double the ram I can use for each individual process?

    - by Derek Reitz
    I don't understand how 32-Bit OS's use RAM on a per process basis. I've read the max RAM my x86 processor running a 32-bit OS can use is 2^32 = 4gb; but that's just for one process, right? 3DS Max keeps crashing, but it typically can never use more than 2GB of RAM before it crashes, if I increase my RAM from 4-8GB, would that double how much RAM I can use for each individual process or actually cause no change in my performance? Also would increasing my VRAM and getting a better graphics card increase the extent to which individual programs can preform? Lastly, is there any way to upgrade a 86-bit processor to be able to run a 64-bit OS? I feel like it would be ridiculous to sell modern processors that are capped at 4GB of RAM? Thanks. Quad-Core Intel i7 Q 720 @ 1.6GHz

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  • Seeing double-cursor in 'recursive RDP'

    - by John
    I'm using a Virtual PC VM on my PC to connect to a remote PC using RDP over a VPN. It works just fine except that in the RDP session, I often see a double mouse cursor... I get a standard mouse-arrow and the context-specific cursor such as a caret or hourglass. It's not a big problem but rather annoying and I wondered if there's any way to fix it, or at least understand where it comes from? Is it because I'm effectively running one RDP session from inside another? My host PC runs W7, my local VM runs XP, and the remote PC access using RDP is W7. Thankyou for any help.

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  • Why Is ToString() Rounding My Double Value?

    - by user163757
    How do I prevent my double value from being rounded when converting to a string? I have tried both Convert.ToString and ToString() with the same result. For example my double may look something like 77.987654321, and the two strings conversions convert to to 77.98765. I need to keep the precision of the value as is.

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  • Double Timezone offset

    - by gAMBOOKa
    I have a timezone name and I want the name of the timezone double its offset. For instance, Asia/Dubai is +4, I want to double that to +8... and have it resolved to Asia/HonkKong Language: PHP Here's a sample of what it would look like: $timezone = "Asia/Dubai" $offset = $timezone->getOffset(); $offset *= 2; $timezone = $offset->getTimeZone(); Output: Asia/HonkKong

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  • need a regex to parse a csv file with double quotes in php

    - by Brandon G
    Trying to parse a csv file that has all the data wrapped in double quotes, because there may be commas in the double quotes. Looks like this: $songs = '"1, 2, 3, 4 (I Love You)","Plain White T's","CBE10-22",15,"CBE10-22","","","CB",984,"","10/05/10"'; $regResult = preg_match( "", $songs, $matches ); I can't figure out a regex that will return the data between the quotes as the matches. I'm sure there is some regex master that can help me with this.

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  • cocoa - converting a double to string

    - by Mike
    I have a double number and I would like to convert it to string. The number is, for example, something like 24.043333332154465777... but if I convert it to string using something like NSString *myString = [NSString stringWithFormat:@"%f", myDouble]; The string is just 24.043333 how do I get a full string the corresponds to the whole double number? What other methods do I have to convert this?

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  • Equality with Double.NaN

    - by chris
    I have the following code... if (Price_Foreign != Double.NaN) { output.Append(spacer); output.Append(String.Format("{0,-10:C} USD",Price_Foreign)); } Which outputs: NaN USD What gives? I'm using Double.NaN to indicate that the value doesn't exist, and shouldn't be output.

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  • Azure storage - double decimal point ignored on save

    - by Fabio Milheiro
    I have a value that is correctly stored in a property of an object, but when I save the changes to the Azure storage database, the double value is stored to the database ignoring the point (7.1000000003 is saved as 711). Also, the property is changed to 711.0. How do I solve this problem? The field is already set to double in the class and the database table.

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  • WPF ListView GridViewColumn Double Click

    - by Kevin
    Hi, I have a WPF ListView that opens a certain window when double clicked on a certain item inside the list view, but I have a problem. When I double click the GridViewColumn, that also opens up a certain window. Is there a way to detect if the sender is a gridviewColumn or a listView item? Thanks

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  • C precision of double: compiler dependent?

    - by yCalleecharan
    Hi,on my 32-bit machine (with an Intel T7700 duo core), I have 15 precision digits for both double and long double types for the C language. I compared the parameters LDBL_DIG for long doubles and DBL_DIG for doubles and they are both 15. I got these answers using MVS2008. I was wondering if these results can be compiler dependent or do they just depend on my processor? Thanks a lot...

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  • Fast double -> short conversion with clamping using SSE?

    - by gct
    Is there a fast way to cast double values to shorts (16 bits signed), currently I'm doing something like this: double dval = <sum junk> int16_t sval; if (val > int16_max) { sval = int16_max; } else if (val < int16_min) { sval = int16_min; } else sval = (int16_t)val; I suspect there's a fast way to do this using SSE that will be significantly more efficient.

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  • Break the nested(double) loop in python

    - by prosseek
    I use the following method to break the double loop in Python. for word1 in buf1: find = False for word2 in buf2: ... if res == res1: print "BINGO " + word1 + ":" + word2 find = True if find: break Is there better way to break the double loop?

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  • javascript turn single line break to double line break

    - by Eric Sim
    Hm... I'm trying to convert single line break into double line break, as in This is a sentence. This is another sentence. into This is a sentence. This is another sentence. Apparently this doesn't work ThisContent = ThisContent.replace(/(\n)/gm, "\n\n"); since it replace everything, including double line breaks. What's the regex to do this?

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