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include "ecidentify.h"
# EC_DOSHIFT -- Minimize residuals by constant shift.
procedure ec_doshift (ec, interactive)
pointer ec # ID pointer
int interactive # Called interactively?
int i, j
double shft, delta, rms, ec_fitpt(), ecf_getd()
begin
shft = 0.
rms = 0.
j = 0
for (i=1; i <= EC_NFEATURES(ec); i = i + 1) {
if (IS_INDEFD (USER(ec,i)))
next
delta = USER(ec,i) - ec_fitpt (ec, APN(ec,i), PIX(ec,i))
delta = delta * ORDER(ec,i)
shft = shft + delta
rms = rms + delta * delta
j = j + 1
}
if (j > 0) {
shft = shft / j
rms = rms / j
if (interactive == YES) {
i = EC_ORDER(ec)
call printf ("Coordinate shift=%5f, rms=%5f")
call pargd (shft / i)
if (j == 1)
call pargd (INDEFD)
else
call pargd (sqrt (rms - shft ** 2) / i)
}
shft = shft + ecf_getd ("shift")
call ecf_setd ("shift", shft)
EC_NEWECF(ec) = YES
EC_NEWGRAPH(ec) = YES
}
end
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