从另一个数组的整数元素创建新数组？ MATLAB

Question

I have created an array tP which contains a mix of integer and non-integer elements. I want to create a new array of the integer element.

The result I would like is in the same form as is returned for, for example:

tP2=find(tP>300);

That is, a list of the element numbers which contain integer values, not a list of the integers themselves.

From this I will then select the desired elements like so:

tP3=tP(tP2);

To do this for integers, what I currently have is:

tP2=find(isinteger(int16(tP)));

But instead of a list of element numbers, I just get tP2=1 returned.

Why does isinteger not work in this case and how can I achieve my required result? Thanks.

Answer 1

使用round

tp2 = find( tP == round(tP) );

Answer 2

As Shai says, comparison to round is an effective way to detect integers.

Next, unless you need the list of matches for something else, you don't need find . Just the comparison will create a mask array, and masks can be used for subscripting.

tP3 = tP(tP == round(tP));

Getting rid of tP2 and the call to find should save time and memory.