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From: Wendy on 4 Apr 2010 10:37 Hi all, I read in a matrix from xls file. The matrix is as follows pvalue = [ NaN NaN NaN NaN; NaN NaN 1.00000000000000e-05 NaN; NaN 4.00000000000000e-05 0 NaN; NaN 0 0 NaN; NaN NaN NaN NaN]; Those NaN elements are empty in the excel file. As all the pvalues are >=0, I set NaN elements to -2, and set caxis=([0 4e-5]). As -2 is out of my caxis, all the -2 elements are plotted with the minimum caxis. I want the -2 elements to be empty on the plot, like surf function does. Can anyone give me some hint on this issue? I was suggested to set a color code for -2 element, but I could not find how to set a color code to a value. Thank you very much. Wendy
From: Anthony Hopf on 4 Apr 2010 11:50 Why not keep the NaN values and plot that? The NaN values will have their own color assigned to them. "Wendy " <wlq121(a)gmail.com> wrote in message <hpa86g$ngb$1(a)fred.mathworks.com>... > Hi all, > > I read in a matrix from xls file. The matrix is as follows > > pvalue = [ NaN NaN NaN NaN; > NaN NaN 1.00000000000000e-05 NaN; > NaN 4.00000000000000e-05 0 NaN; > NaN 0 0 NaN; > NaN NaN NaN NaN]; > > Those NaN elements are empty in the excel file. As all the pvalues are >=0, I set NaN elements to -2, and set caxis=([0 4e-5]). As -2 is out of my caxis, all the -2 elements are plotted with the minimum caxis. I want the -2 elements to be empty on the plot, like surf function does. Can anyone give me some hint on this issue? I was suggested to set a color code for -2 element, but I could not find how to set a color code to a value. > > Thank you very much. > Wendy
From: Wendy on 4 Apr 2010 12:06 Hi Anthony, Thank you for your reply. The NaN are assigned blue. This makes the NaN elements and my small pvalues indistinguishable. Wendy "Anthony Hopf" <anthony.hopf(a)gmail.com> wrote in message <hpacfh$jcj$1(a)fred.mathworks.com>... > Why not keep the NaN values and plot that? The NaN values will have their own color assigned to them. > > "Wendy " <wlq121(a)gmail.com> wrote in message <hpa86g$ngb$1(a)fred.mathworks.com>... > > Hi all, > > > > I read in a matrix from xls file. The matrix is as follows > > > > pvalue = [ NaN NaN NaN NaN; > > NaN NaN 1.00000000000000e-05 NaN; > > NaN 4.00000000000000e-05 0 NaN; > > NaN 0 0 NaN; > > NaN NaN NaN NaN]; > > > > Those NaN elements are empty in the excel file. As all the pvalues are >=0, I set NaN elements to -2, and set caxis=([0 4e-5]). As -2 is out of my caxis, all the -2 elements are plotted with the minimum caxis. I want the -2 elements to be empty on the plot, like surf function does. Can anyone give me some hint on this issue? I was suggested to set a color code for -2 element, but I could not find how to set a color code to a value. > > > > Thank you very much. > > Wendy
From: Anthony Hopf on 4 Apr 2010 12:36 How about making the NaN values very large... like 100 and limiting your color scale to 1e-5 to 1. This will set your small values to different colors and your 100 (read NaN) to the color for 1. you could also use 1e-5 to 1e-3. T "Wendy " <wlq121(a)gmail.com> wrote in message <hpadda$1vi$1(a)fred.mathworks.com>... > Hi Anthony, > > Thank you for your reply. The NaN are assigned blue. This makes the NaN elements and my small pvalues indistinguishable. > > Wendy > > "Anthony Hopf" <anthony.hopf(a)gmail.com> wrote in message <hpacfh$jcj$1(a)fred.mathworks.com>... > > Why not keep the NaN values and plot that? The NaN values will have their own color assigned to them. > > > > "Wendy " <wlq121(a)gmail.com> wrote in message <hpa86g$ngb$1(a)fred.mathworks.com>... > > > Hi all, > > > > > > I read in a matrix from xls file. The matrix is as follows > > > > > > pvalue = [ NaN NaN NaN NaN; > > > NaN NaN 1.00000000000000e-05 NaN; > > > NaN 4.00000000000000e-05 0 NaN; > > > NaN 0 0 NaN; > > > NaN NaN NaN NaN]; > > > > > > Those NaN elements are empty in the excel file. As all the pvalues are >=0, I set NaN elements to -2, and set caxis=([0 4e-5]). As -2 is out of my caxis, all the -2 elements are plotted with the minimum caxis. I want the -2 elements to be empty on the plot, like surf function does. Can anyone give me some hint on this issue? I was suggested to set a color code for -2 element, but I could not find how to set a color code to a value. > > > > > > Thank you very much. > > > Wendy
From: us on 4 Apr 2010 13:32
"Wendy " <wlq121(a)gmail.com> wrote in message <hpa86g$ngb$1(a)fred.mathworks.com>... > Hi all, > > I read in a matrix from xls file. The matrix is as follows > > pvalue = [ NaN NaN NaN NaN; > NaN NaN 1.00000000000000e-05 NaN; > NaN 4.00000000000000e-05 0 NaN; > NaN 0 0 NaN; > NaN NaN NaN NaN]; > > Those NaN elements are empty in the excel file. As all the pvalues are >=0, I set NaN elements to -2, and set caxis=([0 4e-5]). As -2 is out of my caxis, all the -2 elements are plotted with the minimum caxis. I want the -2 elements to be empty on the plot, like surf function does. Can anyone give me some hint on this issue? I was suggested to set a color code for -2 element, but I could not find how to set a color code to a value. > > Thank you very much. > Wendy one of the solutions m=[ NaN NaN NaN NaN NaN NaN 1e-005 NaN NaN 4e-005 0 NaN NaN 0 0 NaN NaN NaN NaN NaN ]; m=flipud(m); % <- !!!!! imagesc(m); ma=~isnan(m); alpha(double(ma)); colorbar; colormap(jet); axis image; axis xy; % <- !!!!! us |