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POParsing a File with Hexadecimal Floating Point Constants in MATLAB
 

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  1. POParsing a File with Hexadecimal Floating Point Constants in MATLAB
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    <p>I am trying to parse a file containing some floating point test vectors in MATLAB.</p> <p>Here is part of the file:</p> <pre><code>b32+ +1.7FFFFFP127 -1.7FFFFFP127 +0.0P0 b32+ +1.000000P0 -1.6D0976P9 -1.6CC976P9 b32+ +1.000000P-126 -1.000000P-126 +0.0P0 b32+ -1.7FFFFFP127 +1.7FFFFFP127 +0.0P0 b32- -1.7FFFFFP127 -1.7FFFFFP127 +0.0P0 b32- +1.000000P0 -1.000000P0 +1.000000P1 b32- -1.7C3AB6P14 +1.000000P0 -1.7C3CB6P14 b32- +1.2F0948P14 +1.000000P0 +1.2F0748P14 b32- -1.000000P-126 +1.000000P-126 -1.000000P-125 b32- +1.000000P-126 +1.000000P-126 +0.0P0 b32- -1.000000P-126 +1.0410ADP-103 -1.0410AEP-103 b32- +1.7FFFFFP127 +1.7FFFFFP127 +0.0P0 b32* +1.12D2C6P92 -1.000000P0 -1.12D2C6P92 b32* +1.7FFFFFP127 -1.000000P0 -1.7FFFFFP127 b32* -1.7FFFFFP127 +1.000000P0 -1.7FFFFFP127 b32* -1.5FEA32P-51 +1.000000P0 -1.5FEA32P-51 b32* -1.000000P-126 +1.000000P0 -1.000000P-126 b32* -1.000000P0 +1.000000P0 -1.000000P0 b32* +1.000000P0 +1.000000P0 +1.000000P0 b32* +1.000000P-126 +1.000000P0 +1.000000P-126 b32* +1.000000P-126 +1.7FFFFFP127 +1.7FFFFFP1 </code></pre> <p>Basically I don't know how to parse this file because of the mixed data type.</p> <p>There are three possible floating point operations shown in this file (addition: b32+, subtraction: b32-, and multiplication: b32*). The first two numbers are the operands and the last number is the result.</p> <p>I want to format the numbers in 32-bit floating point format afterwards (which I could figure out probably). The issue is that I don't know how to get things like 'b32+', and then the numbers into variables in order to convert them into standard floating point format.</p> <p>I plan to implement an algorithm for the numbers where it looks at the sign (+/-) and sets the sign bit based upon that. Looks at the hex between the '.' and the 'P' and sets that as the significand. Then take the number after the P as the unbiased exponent. Then I plan to repeat this procedure for the other numbers.</p> <p>Thank you!</p>
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    1. COWhy is this tagged with [tag:c++] and [tag:c]?
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    2. COJust in case someone in that community comes up with a better c or c+ based solution.
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    3. COsee http://stackoverflow.com/questions/2062259/using-c-c-to-efficiently-de-serialize-a-string-comprised-of-floats-tokens-and?rq=1
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      1. POParsing a File with Hexadecimal Floating Point Constants in MATLAB
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