A few PSPP language constructs copy sets of user-missing values from one variable to another. When the source and target variables have the same width, this is simple. But when the target variable's width might be different from the source variable's, it takes a little more work. The functions described here can help.
In fact, it is usually unnecessary to call these functions directly.
Most of the time
var_set_missing_values, which uses
mv_resize internally to resize the new set of missing values to
the required width, may be used instead.
See var_set_missing_values, for more information.
Tests whether mv's width may be changed to new_width using
mv_resize. Returns true if it is allowed, false otherwise.
If new_width is a long string width, mv may be resized only if it is empty. Otherwise, if mv contains any missing values, then it may be resized only if each missing value may be resized, as determined by