Hello,

Something like this?


myRamp <- colorRampPalette(c("lightblue", "darkblue"))
mypal <- myRamp(20)
mypal[1] <- rgb(1, 1, 1)

#?filled.contour
## Persian Rug Art:
x <- y <- seq(-4*pi, 4*pi, len = 27)
r <- sqrt(outer(x^2, y^2, "+"))
filled.contour(cos(r^2)^2, frame.plot = FALSE,
                plot.axes = {}, col = mypal)
grid()


Hope this helps,

Rui Barradas
Em 04-10-2012 13:25, Loukia Spineli escreveu:
> Dear R users,
>
> I have a 51 by 51 matrix of p-values (named as pvalue_MA). I want to
> present graphically this matrix in a plot (filled contour plot) where both
> axes represent probabilities. I have also added a grid in this plot. I want
> to highlight in white the cells of the grid that represent p-values smaller
> than the (common) significance threshold, 0.05. The code from this plot is
> colored in blue (I had to copy-pasted all this code in order to reach to
> the plot). I suspect that the "problem" might be in the col parameter of
> the filled.contour function. Honestly, I cannot understand why the plot
> appears to be completely white!! I checked the values of my variable and it
> has a great range from 0 to 1.
> Any suggestion/ comment would really help me to move on with my project.
>
> All the best,
>
> Loukia
>
>
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