| color by variable interpolate? [message #50131] |
Tue, 12 September 2006 06:02 |
daisybug1
Messages: 1
Registered: September 2006
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Junior Member |
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Hello all,
I have been trying to wrap my mind around how to make this work, but
have not figured it out and hoped that someone could give me a little
help.
I'm trying to color some data by temperature...
x y t
5 8 -2.5
6 6 -1.3
2 4 -5.3
10 6 -3.5
I'm using the rainbow color table and want the warmest value -1.3 to
correspond to the color 255 (red) and the coldest value -5.3 to
correspond to the color 12 (dark purple)
varyc=-255./(abs(max(t)-min(t))
plot,x,y,/nodata
for i=0, n_elements(x)-1 do begin
plots,x[i],y[i],psym=sym(3),color=T[i]*(varyc)
endfor
That's what I have so far, but it doesn't allow me to start the lower
values exactly at the number I want for example in this case 12, and
skews the data so that the temperatures don't fully encompass the
temperature scale. I'm not even sure if this is the best way to do
this (a for loop). I tried to pass the temperature array as a color,
but I"m really missing the point of starting the lowest value at some
low color number and the highest at 255. I have an incling that it may
have to do with interpolation. Any help would be greatly appreciated!
Thank you everyone!
Jon
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