matlab.io.fits.setTscale

Reset image scaling

Syntax

setTscale(fptr,colnum,tscale,tzero)


Description

setTscale(fptr,colnum,tscale,tzero) resets the scaling factors for a table column according to the equation:

output = (FITS array) * tscale + tzero

The inverse formula is used when writing data values to the FITS file.

This only affects the automatic scaling performed when the data elements are read. It does not change the tscale and tzero keyword values.

Examples

Turn off automatic scaling in a table column where the tscale and tzero keywords are present.

import matlab.io.*
fptr = fits.openFile('tst0012.fits');
fits.movAbsHDU(fptr,2);
scaled_data = fits.readCol(fptr,3);
fits.setTscale(fptr,3,1.0,0.0);
unscaled_data = fits.readCol(fptr,3);
fits.closeFile(fptr);