free grads

()amean

amean (expr, xdim1, xdim2, ydim1, ydim2)

()amaxlocy

This function returns the Y location of maximum grid value over a spatial domain. The syntax is:

amaxlocy(expr, xdim1, xdim2, ydim1, ydim2)

amaxlocx()

This function returns the X location of maximum grid value over a spatial domain. The syntax is:

amaxlocx(expr, xdim1, xdim2, ydim1, ydim2)

amax()

This function returns an area maximum -- the maximum value in a grid spanning an X-Y region. The syntax is:

amax(expr, xdim1, xdim2, ydim1, ydim2)

Using Templates

grads allows you use a single data descriptor file to aggregate multiple data files and handle them as if they were one individual file. The individual data files must be identical in the X, Y, and Z dimensions and have the same list of variables. The time range of each individual file must be indicated it its filename. Beginning with version 2.0, data files may also be aggregated in the ensemble dimension.  

acos(expr)

abs

abs(expr)

Takes the absolute value of the result of expr. Operates on both gridded and station data. Missing data values do not participate.  

This function takes an areal average over an X-Y region. The syntax is:

aave(expr, xdim1, xdim2, ydim1, ydim2)

where:

expr    - any valid grads expression 
xdim1   - starting X dimension expression 
xdim2   - ending X dimension expression 
ydim1   - starting Y dimension expression 
ydim2   - ending Y dimension expression