MATLAB: Checking if a matrix has all its elements filled with one or not

if statement

Suppose I have a matrix like x = [1 1 1 1 1 1]. Now I have to write a if condition, where I have to check whether "x" contains all its elements as ones or not? How to do that. I searched in matlab's help, but couldn't find any direct "command" like to check such an existence.

Best Answer

variant

all(x)

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Thanks everybody, I had my solution

count=sum(x)

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This is explained quite clearly in the if documentation: "An expression is true when its result is nonempty and contains only nonzero elements (logical or real numeric). Otherwise, the expression is false."

Which means:

[0,0,0,0] is false: all values are zero
[0,1,0,1] is false: some values are zero
~[0,0,0,0]=[1,1,1,1] is true: contains only nonzero elements
~[0,1,0,1]=[1,0,1,0] is false: some values are zero

Note that the definition defines a true expression as "contains only nonzero elements" but does not give an upper-limit to the number of nonzero elements.

Best Answer

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MATLAB: Count number 1 in the row

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