How should I create a matrix of costs based on a set of variable?

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I'm trying to make a matrix that depicts costs for a set of tasks. These tasks are the rows of the matrix. The cost matrix is to be based on a multi-attribute weightage of the tasks based on their parameters such as temporal urgency, importance, etc. Now I dont know what kind of a mathematical model to use to get such a cost matrix, as it is to be an input for a linear program, which is what I am studying right now. Can someone point me in the kind of direction I should be looking for such a thing?