how to find the mean of rows and columns matrix

[udka]

Here you go.

[andisheye20]

sorry but i want to calculate the center mass of the matrix for element '1'

[udka · Accepted solution]

Did you enter 1 in element?

[ijustlovemath]

This code should work:

The result is 0-indexed, so change it if you need to.

How it works:

1. Read in the sample array

2. Loop through every row, and pass the current row index into another for loop, call this i

3. Loop through every column of the current row, the index is j.

4. If the element at i, j is equal to the search element, index it out using a conditional indexing tunnel.

5. Concatenate all indexed tunnels, which essentially builds a master list of all the rows/columns where we found the search element

6. Calculate the mean index for both.

I got a mean row of 3.17, mean column of 4.52

[Thoric]

For the centre of mass you need to consider only those elements that are '1'.

So take the coordinates of all of those '1' elements, and calculate the mean of the 'x' and 'y' coordinates.

As an exercise for yourself, try recreating this:

[Thoric]

...and if Altenbach were online he would probably suggest using complex numbers: