Tip 72.
Archived vector
Fig. 72. Archived vector
Very often initial data used for analysis are
given as a few vectors. If the
vectors are volumetrical (many
initial points), then it is
difficult to place them on a display for review and editing. One of the ways of solving this problem – “stowage” the vector in a matrix as if archived form.
The solution of one
of the typical problem of regression analysis is shown in the fig. 72 – search of the
coefficients of a function with one argument in the best way “crowded” to initial points (approximation
with help of least-squares method[1]). In general initial data have to be kept in two
vectors X and Y, but for
convenience of editing we have “pushed” them in the matrix XY. With help of the program our matrix XY “blossoms” out two vectors
X and Y, which
appear in the solution of the problem – in search of the coefficients a
and b, incoming
in the approximate equation.