Check if the number has any digits after the decimal points matlab

Question

Ron Aditya 2014-9-14

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评论： Star Strider 2014-9-15

I have a vector which is a mixture of floating point and whole numbers. I am trying to identify the whole numbers and divide them by 100. Assuming the vector is 'v'

v = [9.3, 6.8, 7, 4.1, 3]

I want to identify 7 and 3. How do I go about this, most of the algorithms I came across on mathworks do not work for a vector or they only return the number of digits after the decimal and if its a whole number i get error.

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Answer 1

Star Strider 2014-9-14

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编辑：Star Strider 2014-9-14

在 MATLAB Online 中打开

This works:

v = [9.3, 6.8, 7, 4.1, 3];
v100 = v(mod(v,1)==0)*100

produces:

v100 =
     700   300

It takes advantage of mod(v,1) yielding the part of any element of v to the right of the decimal. If that is zero (it creates a logical subscript vector where those values are true=1), it multiplies that element by 100 and assigns it to v100.

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Roger Stafford 2014-9-14

You can also use any one of these three: round(v)==v, ceil(v==v, or floor(v)==v in the above code.

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Answer 2

Ron Aditya 2014-9-15

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I ended up using this:

for i=1:l x(i)=str2double([b{i+1,1}{1,1}]); if rem(x(i),1) == 0 x(i)=x(i)/100; end end

Thanks though!

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Star Strider 2014-9-15

My pleasure!

I was under the impression your vector is a numeric array. I didn’t realise it was a string array or cell array of strings. Both Roger’s and my approaches use ‘logical indexing’.

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