# Calculating the mean of each cell of a series of matrices

To calculate the mean value of each cell of a series of Jitter matrices, you can keep the running sums in a matrix, and then divide by the number of instances received. That is, use **jit.+** to keep the sum of all matrices received, use a **counter** to keep track of how many matrices youâ€™ve received, and use **jit./** to divide by that number (or **jit.*** to multiply by one over that number). In this example, a subpatch generates fake input data, and the rest of the patch shows the procedure for calculating the mean. Each **jit.matrix** object has been given a name, to show you what is being held in each one.

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