Mex: useful comparing float values?
3 ビュー (過去 30 日間)
古いコメントを表示
Hello,
i have a mex-script which returns to matlab some float-values. As i have to check the returning data i have also a c-script with the same function as the mex-script. When i want to compare the data i noticed that the matlab-data and c-data have different number of decimal places although both are using float(single) as datatype.
As i am quite a beginner in c and matlab i am not sure how to solve this usefully. thx for any advise! :)
0 件のコメント
採用された回答
Image Analyst
2013 年 5 月 4 日
You have to check if they are within some tolerance of each other. Please see the FAQ. http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F . It gives you some code you can use.
3 件のコメント
Image Analyst
2013 年 5 月 4 日
I think c can show to more than 6 or 7 decimal places. I think you misunderstood. Maybe what they were saying was that single precision numbers are accurate only out to the 6 or 7th decimal place, and that if you show anything after that, it could be just garbage. Those are two different things to say.
Yes, I think using a tolerance, like they do in the FAQ I referred you to, is a good solution.
その他の回答 (0 件)
参考
カテゴリ
Help Center および File Exchange で Introduction to Installation and Licensing についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!