The following tasks belong to the category CALCULATION:

- CALC
- Calculate expressions (using variables) and exercise GIPSY input syntax (calc.c)
- COMBIN
- Combine sets to create new sets using mathematical expressions. (combin.shl)
- CORMAP
- Check whether there is a correlation between two maps (cormap.c)
- DECIM
- Decrease size of a set in any direction with an integer factor (decim.c)
- FLAT
- Apply a flat field correction to a map by fitting a 2-D polynomial to the background. (flat.c)
- FLUX
- Program to calculate flux in user defined box. (flux.c)
- GRADIENT
- Calculates the gradients or the laplacian of a map, using three by three sized templates. (gradient.c)
- MEAN
- Program to calculate the mean of a number of subsets. (mean.shl)
- MEDIAN
- Calculate median of data from set, file, table or expression. (median.c)
- MFILTER
- Apply a median (or average) filter to a (sub)set (mfilter.c)
- MNMX
- This program finds the minimum and maximum value in a subset or part of a subset. It also counts the number of blanks. (mnmx.shl)
- MOMENTS
- Program to calculate moments and other properties of a profile (moments.c)
- MOMENTS2D
- Calculate FWHM and position angle of an ellipse, that represents a 2-dim gaussian, using zero-th, first and second moments of a distribution. The program can find asymmetrical features in a data set. (moments2d.c)
- PATCH
- Find data values at positions of blanks interpolating the data in a small volume around the blanks. (PATCH)
- POTENTIAL
- Program to calculate the 2-dim gravitational potential map of a 2-dim image. This is evaluating the integral given as Eq. 2-3 in the book Galactic Dynamics by Binney and Tremaine. (potential.c)
- reswri
- RESWRI derives the kinematical parameters from the observed velocity field by fitting tilted-rings to the velocity field and fits harmonic terms after convergence of the ROTCUR part of code. RESWRI uses the 1 sigma error-field to calculate its errors. (reswri.c)
- ROTCUR
- ROTCUR derives the kinematical parameters from the observed velocity field by fitting tilted-rings to the velocity field. (rotcur.c)
- STAT
- Program to calculate elementary statistics in user (stat.c)
- SUM
- Program to add a number of subsets. (mean.shl)