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mymat
2011 Nov 20
1
place values into a matrix efficiently?
This question attacked me as I was thinking about matrix value updates.
I probably will never need to do this, but wanted to ask if there are
efficient methods to perform the for-loop in the following sequence.
%xymat<-matrix(rep(0,100) nr=10,nc=10) # empty matrix
%x<-1:10
%y<-sample.int(10,10,rep=T)
%for (j in 1:10) xymat[x[j],y[j]] <- some_function(x[j],y[j]) #to create
either false-color or 3D map .
plot(0:1,0:1,t='n')
% rasterImage(xymat/max(xymat),0,0,1,1,interp=F)
This will produce...