Deconvolution of multiple signals to obtain convolution kernel

I have 2 matrices in Matlab, both are 53513 x 25 array;

• One is a raw signal of the 25 samples. (u)
• Other begin the recorded signal. (c)

I was hoping to perform deconvolution between these 2 signals across all 25 samples to obtain a single kernel.

I tried:

[q,r] = deconv(c,u)

but it doesnt work where it returns:

.

??? Error using ==> filter
First two arguments must be vectors.

Error in ==> deconv at 32
   [q,zf] = filter(b, a, [1 zeros(1,nb-na)]);

.

How should I go about this?