error with || and && operators in a while loop
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Hello!
I have written a script in matlab, using the psychophysics toolbox and I keep getting this error
"Operands to the and && operators must be convertible to logical scalar values.
Error in myscript (line 196)
if strcmp(KbName(keyCode), 'm') || strcmp(KbName(keyCode), 'z')
This is the whole while loop in which the error occurs:
% Check the keyboard.
while respToBeMade == true
[keyIsDown, pressedSecs, keyCode] = KbCheck(-1);
if keyIsDown
if strcmp(KbName(keyCode), 'm') || strcmp(KbName(keyCode), 'z')
disp(KbName(keyCode));
respToBeMade = false;
break;
end
end
end
Thanks on advance for your help.
Best,
-Maria
采纳的回答
I don't have the psychotoolbox, but have a look at the documentation of kbCheck.
The reason you get an error is because the keyCode it returns is either empty or more than one value.
If it can be empty, you could change your test to
if ~isempty(keyCode) && ismember(kbName(keyCode), {'m', 'z'})
If it can be more than one value then
if any(ismember(kbName(keyCode), {'m', 'z'}))
or
if all(ismember(kbName(keyCode), {'m', 'z'}))
depending on what you want to test.
Note that
if ismember(kbName(keyCode), {'m', 'z'})
is equivalent to
if strcmp(KbName(keyCode), 'm') || strcmp(KbName(keyCode), 'z')
but obviously less to type and more extensible if you want to add more accepted key codes.
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