Question

What's the best way to calculate the average for the columns in a 2D-array and return it to a 1D-array.

Answer 1

Something like this in c:

for(col = 0; col < Number of Columns; col++) {
for row = 0; row < Number of Rows; row++) {
testSum += scores[row][col];
}
testAvg = testSum / Number of Rows (which is the number who took the test).
//do something with this testAvg.
totalAvg = testAvg; //makes a running average.
testAvg = testSum = 0; //reset for the next test average.
}