On Jun 6, 2012, at 11:46 AM, David Winsemius wrote:
On Jun 6, 2012, at 5:13 AM, aledanda wrote:
Hi David,
Thank you for your reply.
/Somehow I'm guessing that this will involve load an unnamed package.
Yep:
?create.fourier.descriptor
No documentation for ‘create.fourier.descriptor’ in specified
packages
and libraries:
you could try ‘??create.fourier.descriptor’/
So I indeed forgot to mention in my post that my script starts with
*library('FourierDescriptors')*
/> *count <- seq(1, 7, 0.06)
for (i in 1:count){
I was also wondering what would happen when you passed a vector to
the ":" operator. A warning at the very least. What was the point of
this outer loop?/
I need the outer loop for changing the amplitude of my shapes at
every
iteration.
I specified the amplitudes I want in
count <- seq(1, 7, 0.06).
This outer loop actually works (when I correct the "for (i in
1:count){"
into "for (i in count){.")
It generates in fact all the shapes I want. The problem is with the
inner
loop, it doesn't seem to save any png picture in my directory. The
error is:
*Error in switch(units, `in` = res, cm = res/2.54, mm = res/25.4,
px = 1) *
:
non-numeric argument to binary operator*
I report my all script here again:
library('FourierDescriptors')
count <- seq(1, 7, 1)
# Controlled shapes
for (i in count){
for (s in 1:length(count)){
png("~/Desktop/EMAS/FD_stimuli/s1_",s,".png")
Have you considered how difficult it might be to extract any
information from a .png file that was constructed only one pixel wide?
Perhaps too cryptic and perhaps not exactly the reason the error was
thrown. You called png() with three arguments when you were
incorrectly expecting png() to read you mind and paste() them. The
second argument, 1, was accepted as the width in pixels... and did
not throw the error, but the third argument ".png" created an error
when it was matched to the height parameter of the png() function.
--
David Winsemius, MD
West Hartford, CT
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