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Re: predict


From: Juan Pablo Carbajal
Subject: Re: predict
Date: Wed, 16 Nov 2011 09:39:53 +0100

On Wed, Nov 16, 2011 at 8:08 AM, George Kousiouris
<address@hidden> wrote:
>
> hi,
>
> in matrix multiplication the inner dimensions must be identical. thus when
> you multiply an AxB matrix with a CxD one, you must have that B=C. and the
> result is a AxD matrix
>
> BR,
> George
>
>
> On 11/15/2011 10:50 PM, Tomi Piriyev wrote:
>
> hi,
> "
> if sigmoid(theta'*x) >= 0.5, p =1
> else p=0
> "
> i tried to use this code, , but compiler gets "error: operator *:
> nonconformant arguments (op1 is 1x3, op2 is 100x3)"
> could you help me
>
>
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>
> --
>
>
>
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Note that if the result of sigmoid is a matrix as well, you should put
p to one in the right places. That is

X = theta*x.';
[n m] = size(X);
p = false(n,m);
ind = sigmoid(X) >= 0.5;
p(ind) = true;


-- 
M. Sc. Juan Pablo Carbajal
-----
PhD Student
University of Z├╝rich
http://ailab.ifi.uzh.ch/carbajal/


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