that was ridiculously simple. duh. THanks
Lanre On 8/10/07, jim holtman <[EMAIL PROTECTED]> wrote: > Is this what you want: > > > x <- matrix(runif(100), 10) > > round(x, 3) > [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] > [1,] 0.268 0.961 0.262 0.347 0.306 0.762 0.524 0.062 0.028 0.226 > [2,] 0.219 0.100 0.165 0.131 0.578 0.933 0.317 0.109 0.527 0.131 > [3,] 0.517 0.763 0.322 0.374 0.910 0.471 0.278 0.382 0.880 0.982 > [4,] 0.269 0.948 0.510 0.631 0.143 0.604 0.788 0.169 0.373 0.327 > [5,] 0.181 0.819 0.924 0.390 0.415 0.485 0.702 0.299 0.048 0.507 > [6,] 0.519 0.308 0.511 0.690 0.211 0.109 0.165 0.192 0.139 0.681 > [7,] 0.563 0.650 0.258 0.689 0.429 0.248 0.064 0.257 0.321 0.099 > [8,] 0.129 0.953 0.046 0.555 0.133 0.499 0.755 0.181 0.155 0.119 > [9,] 0.256 0.954 0.418 0.430 0.460 0.373 0.620 0.477 0.132 0.050 > [10,] 0.718 0.340 0.854 0.453 0.943 0.935 0.170 0.771 0.221 0.929 > > ifelse(x > .5, 1, 0) > [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] > [1,] 0 1 0 0 0 1 1 0 0 0 > [2,] 0 0 0 0 1 1 0 0 1 0 > [3,] 1 1 0 0 1 0 0 0 1 1 > [4,] 0 1 1 1 0 1 1 0 0 0 > [5,] 0 1 1 0 0 0 1 0 0 1 > [6,] 1 0 1 1 0 0 0 0 0 1 > [7,] 1 1 0 1 0 0 0 0 0 0 > [8,] 0 1 0 1 0 0 1 0 0 0 > [9,] 0 1 0 0 0 0 1 0 0 0 > [10,] 1 0 1 0 1 1 0 1 0 1 > > > On 8/10/07, Lanre Okusanya <[EMAIL PROTECTED]> wrote: > > Hello all, > > > > I am working with a 1000x1000 matrix, and I would like to return a > > 1000x1000 matrix that tells me which value in the matrix is greater > > than a theshold value (1 or 0 indicator). > > i have tried > > mat2<-as.matrix(as.numeric(mat1>0.25)) > > but that returns a 1:100000 matrix. > > I have also tried for loops, but they are grossly inefficient. > > > > THanks for all your help in advance. > > > > Lanre > > > > ______________________________________________ > > R-help@stat.math.ethz.ch mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > > > > -- > Jim Holtman > Cincinnati, OH > +1 513 646 9390 > > What is the problem you are trying to solve? > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.