problem.ftran

Purpose

Pre-multiplies a (column) vector provided by the user by the inverse of the current matrix.

Synopsis

problem.ftran (vec)

Argument

vec	Array of length problem.attributes.rows containing the values which are to be multiplied by the basis inverse. The transformed values appear in the array.

Example

To get the (unscaled) tableau column of structural variable number jcol, assuming that all arrays have been dimensioned, do the following:

y = [0,1,0,0]
p.ftran (y)
print ("ftran result:", y)

Further information

If the problem is in a presolved state, the function will work with the basis for the presolved problem.