Decoding error message

[asha g]

 I have a function which has :

P(2) = gammaox.*Q1'(2)./Cm(2) + gammaox1.*Qfd'(2)./Cm(2) 
-Iionsoma1./Cm(2)+Istim1./Cm(2)
I get the following error for this line 

error: A(I) = X: X must be a scalar or a vector with same length as I
error: assignment failed, or no method for `matrix = matrix'
error: evaluating assignment expression near line 54, column 5

Please help me understand what is wrong.
Thanks
Asha 



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