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include <tbset.h>
#* HISTORY *
#* B.Simon 07-Jan-99 Original
# CONVERT_COL -- Convert the units of a table column
procedure convert_col (tp, cp, newunits, factor)
pointer tp # i: table descriptor
pointer cp # i: column descriptor
char newunits[ARB] # i: new column units
double factor # i: conversion factor
#--
double value
int nrow, nelem, irow, nlen, ilen
pointer sp, buffer
int tbpsta(), tbcigi(), tbagtd()
begin
# Change column units
call tbcnit (tp, cp, newunits)
# Get column dimensions
nrow = tbpsta (tp, TBL_NROWS)
nelem = tbcigi (cp, TBL_COL_LENDATA)
# Allocate buffer to hold array elements
call smark (sp)
call salloc (buffer, nelem, TY_DOUBLE)
# Multiply column values by conversion factor
if (nelem == 1) {
# Scalar column, use element get and put
do irow = 1, nrow {
call tbegtd (tp, cp, irow, value)
if (! IS_INDEFD (value)) {
value = factor * value
call tbeptd (tp, cp, irow, value)
}
}
} else {
# Array element, use array get and put
do irow = 1, nrow {
nlen = tbagtd (tp, cp, irow, Memd[buffer], 1, nelem)
do ilen = 0, nlen-1 {
if (! IS_INDEFD (Memd[buffer+ilen])) {
Memd[buffer+ilen] = factor * Memd[buffer+ilen]
}
}
call tbaptd (tp, cp, irow, Memd[buffer], 1, nlen)
}
}
call sfree (sp)
end
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