Home/ Questions/Error: "operands to the || and && operators must be convertible to logical scalar values" - How to solve it?
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zgoyette
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Asked: 2022-05-05T11:22:27+00:00 In:

Error: “operands to the || and && operators must be convertible to logical scalar values” – How to solve it?

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I get the error: “operands to the || and && operators must be convertible to logical scalar values” when I try to run the program below:

a = floor(rand(5,5).*255)
a_thresh = floor(rand(5,5).*255)
a(a < a_thresh.*0.4) = 0
a(a > a_thresh.*1.2) = 0
a(a>= a_thresh .* 0.4 && a <a_thresh.* 0.5) = ((a - a_thresh.*0.4)/(a_thresh.*0.5 a_thresh.*0.4)) .* a;

The error appears the system notifies as follows:

Operands to || and && operations must be convertible to logical scalar values

I tried to solve it with another sample. I got the reference in the community forum, but it still returned an invalid result. If someone knows the solution, please give me the support. Thanks!

logical scalar valuesoperands to the || and &&
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2 Answers

  1. There are two types of logical operators that can be used for certain functions in matlab. 

    For example, you can utilize or && as well as & to operate on scalers. To logically compare vectors (which is performed by comparing each element) it is necessary to make use of the operator &. 

    If you are trying to determine whether two vectors are equivalent then use the function isequal(a,b) instead of. The same uses for | |.

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  2. Regarding your second problem described in a comment: the number of elements on the left is different because you’re using indices (selecting only certain features). You’re working with the entire matrix a and a_thresh on the right. It would help if you used indices on both sides, so I suggest storing it in a variable and then using it as an array subscript, along these lines:

    idx = (a >= a_thresh*0.4 & a < a_thresh*0.5);
a(idx) = ((a(idx)-a_thresh(idx)*0.4) ./ (a_thresh(idx)*0.5*a_thresh(idx)*0.4)) .* a(idx);
    I’m not sure if the calculation itself is correct, so give it a go!
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