error in matrix multiplication.

sir i am using a simple line of code..

v(1)=(x*w1(1,:)')+(1*bias1(1,1));
y(1)=1/(1+exp(-v(1)));  "

where w1 is a 15x784 matrix, bias1 is a 1x15 matrix and x is a 1x784 matrix. the error shown while doing the simple vector multiplication is::::::::

[ ??? Error using ==> mtimes MTIMES is not fully supported for integer classes. At least one input must be scalar.
To compute elementwise TIMES, use TIMES (.*) instead.]

[KSSV]

Post the whole code...

[VISHAL SINGH]

i have written only a part of the whole progam..i mean i began to write.... just to check errors i run it....then it showed this error.

Answer 1

[dpb]

While I don't see it at first blush in the code, one (or both) of the two variables must be integer class--

>> i1=eye(3);
>> i2=int16(ones(3,1));
>> i1*i2
Error using  * 
MTIMES is not fully supported for integer classes. At least one input must be scalar.
To compute elementwise TIMES, use TIMES (.*) instead. 
>> i1*double(i2)
ans =
   1
   1
   1
>>

See which is/are integers of some type and cast to a real (single or double) to do the computation.

ADDENDUM

On further inspection, the array train0 must be the integer-valued one...

x=double(train0(m,:))/255;       %%picking a row from the set

will fix your present problem; whether you will then need to recast back to integer class for a result I don't know...

[VISHAL SINGH]

thanks a lot sir.... seems that for present my problem has been solved. thanks again.