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how can i convert a string to a number (without using the str2num function) so if the string represents a number the value is 1? (otherwise the value is 0)...

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Zaza 2012-11-23

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https://ww2.mathworks.cn/matlabcentral/answers/54600-how-can-i-convert-a-string-to-a-number-without-using-the-str2num-function-so-if-the-string-repres

for example:

st = '23487';

r = 1;

(also '00023487' is acceptable or any number of leading zeros).

but

st = '-4e';

r = 0;

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Daniel Shub 2012-11-23

I am closing this question. Please edit it to include what you have tried so far.

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回答（2 个）

Arthur 2012-11-23

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https://ww2.mathworks.cn/matlabcentral/answers/54600-how-can-i-convert-a-string-to-a-number-without-using-the-str2num-function-so-if-the-string-repres#answer_66278

在 MATLAB Online 中打开

r = ~isnan(str2double(st));

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Azzi Abdelmalek 2012-11-23

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https://ww2.mathworks.cn/matlabcentral/answers/54600-how-can-i-convert-a-string-to-a-number-without-using-the-str2num-function-so-if-the-string-repres#answer_66279

在 MATLAB Online 中打开

a='1.3125';
r=numel(regexp(a,'[0-9.]'))==numel(a)

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