Determine the slope of a line passing through the points a=[x1 y1] and b=[x2 y2].
I strongly suggest you read the "What Makes a Good Problem?" section on http://www.mathworks.com/matlabcentral/anniversary/triathlon_guidelines. Please pay attention to the second guideline: It should have more than one test point.
The problem title and description have been improved and the test suite expanded.
Link from Peng Liu's comment has been down for several days. However the advice is still valid: Test Suites should include at least four test cases — although more are often necessary to prevent hard-coded workarounds.
Simple equation: Annual salary
Average of square wave
Create a Matrix of Zeros
Remove all the columns contains only zero
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