Search Comments and Ratings
Comments and Ratings
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| Date | File | Comment by | Comment | Rating |
| 06 Aug 2009 | Variable Precision Integer Arithmetic Arithmetic with integers of fully arbitrary size. Arrays and vectors of vpi numbers are supported. | Hamed, Khaled | More fun with vpi2english if you use, for example, speak(vpi2english(vpi(2^52))) The function "speak" is summission File ID: #4769 named "Speak". There are a also a couple more "speak" submissions around. |
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| 31 Jul 2009 | Fractions Toolbox create and manipulate fractions (K+N/D) using exact arithmetic | Hamed, Khaled | Very useful toolbox, especially with the added precision of the vpi toolbox. I think the demo_fr.m file needs an "echo on" at the beginning to see the header of each of the demo problems, rather than answers only (followed by echo off at the end). |
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| 31 Jul 2009 | Fractions Toolbox create and manipulate fractions (K+N/D) using exact arithmetic | Hamed, Khaled | It seems to require vpi to be in the Matlab path, or a previous instance of a vpi. >> fr(1,7)
Error in ==> fr.fr at 201
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| 29 Jul 2009 | Variable Precision Integer Arithmetic Arithmetic with integers of fully arbitrary size. Arrays and vectors of vpi numbers are supported. | Hamed, Khaled | Another good reason to use higher preciesion: the famous subtractive cancellation error >> x=77617;y=33096;z=33375*y^6+100*x^2*(11*x^2*y^2-y^6-121*y^4-2)+550*y^8 z = -1.5112e+023 >> x=sym(77617);y=sym(33096);z=33375*y^6+100*x^2*(11*x^2*y^2-y^6-121*y^4-2)+550*y^8 z = -200 >>x=vpa(77617);y=vpa(33096);z=100*x^2*(11*x^2*y^2-y^6-121*y^4-2)+33375*y^6+550*y^8
>> x=vpi(77617);y=vpi(33096);z=33375*y^6+100*x^2*(11*x^2*y^2-y^6-121*y^4-2)+550*y^8 z = -200 vpi is as accurate as symbolic and vpa, roughly four times faster than sym and eight times faster than vpa |
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