[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: newbie question
|
From: |
Marco Atzeri |
|
Subject: |
Re: newbie question |
|
Date: |
Tue, 08 Nov 2011 23:05:32 +0100 |
|
User-agent: |
Mozilla/5.0 (Windows NT 5.1; rv:8.0) Gecko/20111105 Thunderbird/8.0 |
On 11/8/2011 10:58 PM, TONY HOLDROYD wrote:
I have an array called X, say and I'd like to set the first column to
all zeros.
I can do it with a loop but would like to know how I can vectorise it
Thanks in advance
T.H.
help zeros
assuming you have a matrix like this
octave:5> a=rand(3,5)
a =
0.47996 0.70635 0.21510 0.55275 0.54520
0.35639 0.32545 0.25808 0.69724 0.14818
0.91154 0.21920 0.52211 0.47036 0.75162
you can zeroed the first column in this way
octave:6> a(:,1)=zeros(size(a,1),1)
a =
0.00000 0.70635 0.21510 0.55275 0.54520
0.00000 0.32545 0.25808 0.69724 0.14818
0.00000 0.21920 0.52211 0.47036 0.75162
Regards
Marco