automatic creating of array

Hi,

I would like automatic create a matrix, or array. My program should work like this:

If I insert any number n, then it will create matrix, or array with elements i1;i2;i3;..in with size nx1.

For example: if n=2; then result is [i1;i2],

ans =

     i1
     i2

if n=4; then result is [i1;i2;i3;i4].

Please can you help me?

Thank you

[Daniel Shub]

You cannot have this. Well you probably can, but you would have to define your own data type. Do you want [i1;i2] or do you want [1i;2i]. The first is not valid MATLAB syntax, the second is (they are imaginary numbers). You could have ['i1';'i2'], but its size will be nx2. You will also run into problems when n gets to 10. You can also have {'i1';'i2'}, which will have size nx1 and won't fail when n gets to 10, but is not the same as [i1;i2].

More to the point, what have you tried so far?

[Matt Tearle]

Are i1, i2, etc variables? Or do you want the literal strings "i1", "i2", etc?

[john]

Daniel,

{'i1','i2'} will by perfect. Do you know do this?

Matt Tearle,

I use usually command sym for create i1, i2.... in M-file. For me 1,2,3 and i1,i2 are the same, mean the same.

But Matlab help is written: sym Define symbolic objects

So I don't know what is 1,2,3,4, and i1,i2...

[Jan]

@vansac: This is a public forum. Please post your questions here and not per email. Please take the time to read my profile.

Answer 1

[Fangjun Jiang]

a=(1:n)'

or

a=cellstr(strcat('i',num2str((1:n)')))

[Daniel Shub]

It fails the size nx1 requirement.

[Fangjun Jiang]

Good point. Updated!

[john]

Thank you so much Fangjun Jiang, good job :)