My Selection Dialog Box Contains Two Options, but only Displays one Image
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I attached an image of my code. For some reason when I choose either option(subtraction or division) in the dialog box the same image appears. I'm not sure what's wrong with my code.
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Walter Roberson
2018-8-22
Change
if 'Subtraction'
to
if length(indx) ~= 1
uiwait(msgbox('Must select exactly one choice'));
elseif strcmp(list1{indx}, 'Subtraction')
2 个评论
Walter Roberson
2018-8-28
Your existing code
if 'Subtraction'
does not compare the user input to anything. Instead, it is an example of if being applied to a vector of values. When you apply if to a vector of values, the if is considered to succeed if all of the values in the vector are numerically non-zero. 'S' and 'u' and 'b' and so on are not char(0), so all of the entries in the vector are indeed numerically non-zero, so the test was considered to always succeed.
Note: the character '0' is char(48), numerically 48, and so is non-zero. Only char(0), known formally as NUL, is considered to be numerically zero.
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