Only gu values tu ?

Question

Steven Thies 2021-2-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/749739-only-gu-values-tu

评论： Rena Berman 2021-5-6

Hello Matlab community,

i created a script and everything works but i want to add that the script accepts also only integer values for m. How can i do this?

i = 0;
m = input('please number: ','s');
while isnan (str2double(m)) == true || str2double(m)<0
m = input('please again: ','s');
if isnan (str2double(m)) == true || str2double(m)<0
    i = i+1;
    if i == 4
    return
    end
else
    break
end
end

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Stephen23 2021-2-19

编辑：Stephen23 2021-2-19

在 MATLAB Online 中打开

Original question by Steveb Thies retrieved from Google Cache:

http://web.archive.org/web/20210219132415/https://webcache.googleusercontent.com/search?q=cache%3ACsTby2I8PUAJ%3Ahttps%3A%2F%2Fuk.mathworks.com%2Fmatlabcentral%2Fanswers%2F749739-only-integer-values

http://web.archive.org/web/20210219132812/https://www.mathworks.com/matlabcentral/answers/749739-only-gu-values-tu

"Only integer values ?"

Hello Matlab community,

i created a script and everything works but i want to add that the script accepts also only integer values for m. How can i do this?

i = 0;
m = input('please number: ','s');
while isnan (str2double(m)) == true || str2double(m)<0
m = input('please again: ','s');
if isnan (str2double(m)) == true || str2double(m)<0
    i = i+1;
    if i == 4
    return
    end
else
    break
end
end

Rena Berman 2021-5-6

(Answers Dev) Restored edit

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Answer 1

Les Beckham 2021-2-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/749739-only-gu-values-tu#answer_627429

To test for integer values of double numbers (doubles are the default numeric type in Matlab), I would suggest using mod(m,1).

So, in your case, replace "isnan (str2double(m)) == true || str2double(m)<0" with "mod(m,1) ~= 0" to detect a number that is not an integer.

Of course your code does nothing whether the test passes or fails so I'm not sure what the point is. I assume you have left some things out?

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Answer 2

Walter Roberson 2021-2-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/749739-only-gu-values-tu#answer_627439

positive integers have the property that all of their characters are one of '0','1','2','3','4','5','6','7','8','9', or '+'... unless you want to accept exponential notation as well, in which case the characters might also be 'd', 'D', 'e', 'E', '.', or '-' .

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Les Beckham 2021-2-19

Your answer made me notice that Steven was using the 's' option in his input call. I had missed that before.

Perhaps remove the 's' option and use mod as I suggested? Still, the example code does nothing with the result, so it is difficult to tell what the desired behavior is.

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