# Documentation of keep_var

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| Local Index (files in subdir) (short | long)

## Function Synopsis

[xkeep, ykeep] = keep_var(lim, x, y);

## Help text

[xkeep, ykeep] = keep_var(lim, x, y);
where lim = [minx maxx miny maxy] to be kept.
If lon and lat are not input, then they are assumed
to be global variables under the names XAX and YAX.

## Cross-Reference Information

## Listing of function keep_var

function [xkeep, ykeep] = keep_var(lim, x, y);
if nargin == 1;
global XAX YAX
x = XAX;
y = YAX;
end
if (lim(2) <= lim(1) | lim(4) <= lim(3))
error(['lim must be input as [minx maxx miny maxy]; '...
'try keep_var2'])
end
xkeep = find(x >= lim(1)-eps & x <= lim(2)+eps);
ykeep = find(y >= lim(3)-eps & y <= lim(4)+eps);