Problems inserting value into matlab array

Question

I am trying to insert a value into Matlab vector like this:

 P = [ P(1:pos) point P(pos+1:end-1) ];

Yet I keep getting this error:

??? Error using ==> horzcat
CAT arguments dimensions are not consistent.

Error in ==> main at 65
 P = [ P(1:pos) point P(pos+1:end-1) ];

There is end-1 because I red that error above have something to do with arrays limits mismatch.

P.S. I know that value insertion into arrays is pretty common issue yet this seams to be the simplest way to do it and I really would like to understand why it would not work.

jerad · Accepted Answer · 2012-11-24 20:07:55Z

1

This statement is attempting to concatenate horizontally

P = [ P(1:pos) point P(pos+1:end-1) ]

But your vector P is a column vector.

What you need is a row vector, so transpose P first

P=P';

answered Nov 24, 2012 at 20:07

jerad

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3 Comments

Acorbe Over a year ago

It is sufficient to cat vertically then, using ;

jerad Over a year ago

@Acrobe, yes P=vertcat(P(1:pos), point, P(pos+1:end-1)), but my personal taste would be to use the easiest statement to type which is to use the [] syntax.

Acorbe Over a year ago

@jerad, well, indeed I ment something way easier like P = [P(...) ; p ; P(...)]..;)

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