How to put values in matrix based on some condition?

Hi,

I have a matrix. I want put 0 value in (2,1), (3,1), (4,1), (5,1) ... (n,1) positions. ***Not in (1,1) position.

Is it possible to do it with a single line of code?

Thanks.

Answer 1

[Rob Campbell]

>> r=rand(5);
>> r(2:end,1)=0

r =

    0.0596    0.0967    0.6596    0.4538    0.1734
         0    0.8181    0.5186    0.4324    0.3909
         0    0.8175    0.9730    0.8253    0.8314
         0    0.7224    0.6490    0.0835    0.8034
         0    0.1499    0.8003    0.1332    0.0605

Is that what you need?

[Rasif Ajwad]

Yeah, thanks. I got the idea. So now, f I want 0 value in (1,1), (5,1), (9,1) etc. positions I just need to write:

 r(1:4:end,1)=0

Right?

[Rob Campbell]

Yep!