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# INNER DIMENSIONS MUST AGREE

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KAPIL MAMTANI on 27 Apr 2016
Closed: MATLAB Answer Bot on 20 Aug 2021
Hi, I am having trouble in my code as I am trying to solve set of ODE`s and Exponential equations all 9 of them are dependent on each other and need to be solved simultaneously. Please someone see through it and help me. I am attaching my code.
Jan on 28 Apr 2016
Use a well tested ODE integrator of Matlab instead of a hard coded method without stepsize control.

Muhammed Fasil on 28 Apr 2016
In an assignment A(:) = B, the number of elements in A and B must be the same.
Error in Untitled (line 146) SOM(i+1) = SOM(i)+(s1+(2*s2)+(2*s3)+s4)*(h/6);
KAPIL MAMTANI on 28 Apr 2016
Mr Fasil i know that error is in that line....thank you very much
Jan on 28 Apr 2016
@KAPIL MAMTANI: You knew it, but the readers in the forum did not get this information before.

Walter Roberson on 28 Apr 2016
Your function handles for S and U and W involve the vector Y, so each place that it appears that you are calculating a scalar in the loop, s1, s2, and so on, you are calculating a vector; the one exception is t1. You can index that vector afterwards, but if you are going to be doing that you should be asking why you are calculating the entire vector: it probably indicates a logic error in your code.
KAPIL MAMTANI on 28 Apr 2016
sir, Actually i need you to check whether i am solving these quations correctly in matlab....is the interdependency for variables among ODEs and Exponential equations is good.
Jan on 28 Apr 2016
Edited: Jan on 28 Apr 2016
@KAPIL MAMTANI: How could we know? All we see is your code, so we cannot compare it with what you intented to implement.