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Only gu values tu ?

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Steven Thies
Steven Thies 2021 年 2 月 18 日
コメント済み: Rena Berman 2021 年 5 月 6 日
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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Rena Berman
Rena Berman 2021 年 5 月 6 日
(Answers Dev) Restored edit

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回答 (2 件)

Les Beckham
Les Beckham 2021 年 2 月 19 日
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?

Walter Roberson
Walter Roberson 2021 年 2 月 19 日
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 '-' .
  1 件のコメント
Les Beckham
Les Beckham 2021 年 2 月 19 日
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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