[R] cuts and breaks

[José Ernesto Jardim]

Hi

I'm using the "image" function to produce a plot and I want to define 
the breaks using "cut" and the colors using "heat.colors".

 > 
image(interp(mat2[,2],mat2[,1],mat2[,3]),breaks=cut(mat2[,3],30),col=heat.colors(29))
Error in image.default(interp(mat2[, 2], mat2[, 1], mat2[, 3]), breaks = 
cut(mat2[,  :
        must have one more break than colour


The error message is not clear to me because I'm using 30 to cut and 29 
to heat.colors.

What am I doing wrong ?

Thanks

EJ

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