# incompatible array sizes for 2x1 column vectors

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Timothy Dunning
on 2 Dec 2022

Answered: Timothy Dunning
on 7 Dec 2022

I have an array, z, with 2 rows and an iteratively expanding amount of columns the first of which is assigned: z(:,1) = [0,2500];

I pass the current (nth number) value of the array with z = ivpsolver(z(:,n)) and then again with z(:,n+1) = rungekutta(z(:,n));

in this function I get an error on a line that says: znext = z + (1/6)*(Az+2*Bz+2*Cz+Dz); where Az, Bz, Cz and Dz are 1x2 column vectors (as z should be). The error states "Arrays have incompatible sizes for this operation."

am I missing something obvious or is the error likely somewhere else?

##### 6 Comments

Thomas
on 7 Dec 2022

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