One of the types of objects in Praat. A Matrix object represents a function z (x, y) on the domain [xmin, xmax] × [ymin, ymax]. The domain has been sampled in the x and y directions with constant sampling intervals (dx and dy) along each direction. The samples are thus z [iy] [ix], ix = 1 ... nx, iy = 1 ... ny. The samples represent the function values z (x1 + (ix - 1) dx, y1 + (iy - 1) dy).
With Inspect, you will see the following attributes.
After creation of the Matrix, xmin, xmax, ymin, ymax, nx, ny, dx, dy, x1, and y1 do not usually change. The contents of z do.
Normally, you will want xmin ≤ x1 and xmax ≥ x1 + (nx - 1) dx.
If a simple matrix has x equal to column number and y equal to row number, it has the following attributes:
If the matrix represents a sampled signal of 1 second duration with a sampling frequency of 10 kHz, it has the following attributes:
If the matrix represents a complex spectrum derived with an FFT from the sound of example 2, it has the following attributes:
© ppgb, February 16, 2003