How to simulate a neural network with multiple inputs?

I want to simulate a feedforward neural network function approximation with 3 inputs and 1 output, using "sim".

Inputs are in a single matrix P=3x200 like this:

-0,913562110156178 -0,0162574697296392 -0,381475124730110 0,921963579110850 .... %200 elements in each row

-0,700281347065181 0,860956138791766 0,755557883852976 0,0202261796420851 ....

0,980353564366057 -0,890954009336161 -0,926431057331990 0,825679256897664 .....

When I write this, I get a 1x200 matrix :

simul_net= sim(net,P);

But when I when I put in the function the matrix P as an input I get a 3x200 matrix as output.

How can I get a 3x200 matrix using "sim" in order to aggre with the output of the function?