How to remove an element in an array if this element is smaller than 1?

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YZ 2014-9-3

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评论： YZ 2014-9-3

Hi, Everyone,

There are two arrays with the same size. For example: A=[1, 0.5, 2, 0.75, 3, 0.85, 4, 5]; B=[1, 2, 3, 4, 5, 6, 7, 4]. How to remove an element in A if this element is smaller than 1 OR this element is larger than the corresponding element with the same index in B?

I used the following line but it didn't work:

A((A < 1) | | (A > B)) = [];

MATLAB returned the following red lines: "Operands to the and && operators must be convertible to logical scalar values."

The result I want is A=[1, 2, 3, 4].

At the same time I also want to do the same operation to B. If the element in A is smaller than 1, the corresponding element in B will be removed, and if the element in A is larger than the corresponding element in B, that element in B will also be removed. So the resultant B I want is B=[1, 3, 5, 7].

Hope someone can help. Many thanks.

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Answer 1

Image Analyst 2014-9-3

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https://ww2.mathworks.cn/matlabcentral/answers/153301-how-to-remove-an-element-in-an-array-if-this-element-is-smaller-than-1#answer_150608

在 MATLAB Online 中打开

Too many |. Try this:

A((A < 1) | (A > B)) = [];

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Joseph Cheng 2014-9-3

编辑：Joseph Cheng 2014-9-3

To give a bit more information on the | vs | | and & vs &&. Is that the double symbol version are short circuit versions. The difference is that the second operand (short circuited) is evaluated only if the first operand is not fully determined. so with that said it doesn't really work for arrays as there are multiple true and false results.

& (AND operator) and | (OR operator) can operate on arrays in an element-by-element-wise fashion.
&& and are short-circuit versions where the second operand is only evaluated if the result is not fully determined by the first operand. These can only operate on scalars, not arrays.