Error In finding a variable inside a nested loop..

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satish kumar 2020-5-7

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评论： satish kumar 2020-5-7

I am getting an error of "Operands to the || and && operators must be convertible to logical scalar values". Here, I need to plot figure(2), figure(3). i don't understand how to solve this. Any help is very much appreciated. I am attachhing my code here.

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KSSV 2020-5-7

When code is run, it says undefined variable m.

satish kumar 2020-5-7

Thanks again KSSV for the respone man. I just forgot to remove that 'm' . i don't need 'm' for now. I see an error in if conditional statement in the nested loop. i am updating my code here again. could you just check it.

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Answer 1

Walter Roberson 2020-5-7

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The code you posted cannot encounter that error unless you uncomment some code. If you do uncomment, then

elseif lambdat(:,:) > 0.34522         pi/2 - lambdam pi/2 + lambdam  0.34522 < lambdat(:,:) &&

What would be the intent of that code? MATLAB would parse it like

    elseif lambdat(:,:) > 0.34522
        pi/2 - lambdam
        pi/2 + lambdam
        0.34522 < lambdat(:,:) &&

complete with an error because the statement is not finished on the line.

Your lambdat is a non-scalar. When you test a non-scalar in an if or elseif the condition is only considered true if all of the values are non-zero . So if some of the lambdat values are > 0.34522 but not all of them are, then the condition would fail.

You should probably be using logical indexing, or else using a loop so you are only testing one value at a time.