Matrices in editorial computing
Elements of matrices saved as matrix files of Survo can be used in
computations.
The element in the ith row and jth column of matrix A (saved as A.MAT)
is referred to by MAT_A(i,j).
The row and column indices i,j can be also row and column labels.
For example, if R is a correlation matrix, MAT_R(Height,Weight)
is the correlation coefficient between variables `Height' and `Weight'
and it can be used as a part of any expression in editorial computing.
This property is particularly useful in calculation with empirical
functions whose values are saved in vectors or matrices.
Assume that life expectancies (in years) are saved as columns
`Male' and `Female' for ages (as row labels) 0,1,...,85 in a matrix
file LIFE.
Then MAT_LIFE(30,Female) gives the life expectancy for a 30 years old
female.
See also SHORTF? (Shorthand notation for functions).
A = More information on arithmetics
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