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From: db on 12 May 2010 13:14
Hi, I am pretty new to matlab. I am trying to create a new column
variable "newcl", but I don't get newcl variable in the workspace.
could anyone help me ? Thanks !

a = [1,1,2,3,5,10,20,13,2,8,12,2,4,5,9,4,10]'
b = [1,2,3,4,5,6,7,8,9,10,11,6,4,5,20,3,4]'

if (a > b)
newcl = -1;
end
From: Steven Lord on 12 May 2010 13:20

"db" <daronnebonneau(a)gmail.com> wrote in message
news:586df769-beb0-4b84-9012-0947acde6a21(a)l31g2000yqm.googlegroups.com...
> Hi, I am pretty new to matlab. I am trying to create a new column
> variable "newcl", but I don't get newcl variable in the workspace.
> could anyone help me ? Thanks !
>
> a = [1,1,2,3,5,10,20,13,2,8,12,2,4,5,9,4,10]'
> b = [1,2,3,4,5,6,7,8,9,10,11,6,4,5,20,3,4]'
>
> if (a > b)

Type the following command and look at the Remark labeled something like
"Nonscalar conditions" in the document that appears for an explanation why
the body of your IF statement is not being executed:

doc if

Do you want a vector of zeros and -1's the same length as a (and b, since
it's the same length) where newcl(k) is -1 if a(k) > b(k) and newcl(k) is 0
otherwise? If so, you can use logical indexing.


newcl = zeros(size(a)); % Preallocate newcl to be the correct size
newcl(a > b) = -1;


Alternately, the SIGN function might be of use to you.

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ


From: us on 12 May 2010 13:43
db <daronnebonneau(a)gmail.com> wrote in message <586df769-beb0-4b84-9012-0947acde6a21(a)l31g2000yqm.googlegroups.com>...
> Hi, I am pretty new to matlab. I am trying to create a new column
> variable "newcl", but I don't get newcl variable in the workspace.
> could anyone help me ? Thanks !
>
> a = [1,1,2,3,5,10,20,13,2,8,12,2,4,5,9,4,10]'
> b = [1,2,3,4,5,6,7,8,9,10,11,6,4,5,20,3,4]'
>
> if (a > b)
> newcl = -1;
> end

one of the many solutions

r=-1*(a>b);

us
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