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flag an error message when a scalar is complex

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Hi,
I would like to include in my algorithm an error message where it will tell me that a scalar is complex. So for example I would like to implement in Matlab the following idea
if scalar == complex number
show error message
end
How I can implement this Matlab ?
Thanks

Accepted Answer

Nobel Mondal
Nobel Mondal on 31 May 2015
if ~isreal(num)
error('This is a complex number.')
end
  2 Comments
msh
msh on 31 May 2015
Edited: msh on 31 May 2015
Thanks for the quick response. One clarification. In the ~isreal(num) , num is the relevant scalar, correct? can this be also extended to matrices ?
Nobel Mondal
Nobel Mondal on 31 May 2015
Yes, num is the scalar which you want to check for.
For matrix:
>> A = [ 1 2 3; 4 5+6i 7];
>> isreal(A)
ans =
0
>> isreal(A(1,1))
ans =
1
>> isreal(A(2,2))
ans =
0
Hope this clear things up for you.

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