Plotting A Matrix Using Surfc

Question

Brian Peoples 2019-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/458391-plotting-a-matrix-using-surfc

评论： Walter Roberson 2019-4-25

Hello--

I am struggling an recieivng an error when I try to plot a matrix using surfc (in a function). I was wondering if anybody knew why.

My input for N is 10.

function lake = MakeLake_BDP(N)
lake = zeros(N,N);
lake(1,:) = -999;
lake(N,:) = -999;
lake(:,1) = -999;
lake(:,N) = -999;
%randn where the dist has a mean of 4 and sd of 2
lake(2:N-1,2:N-1) = 4 + 2.*randn(N-2);
T = lake;
w = .175; %weighing factor
for k = 1:15
    T(1,:,k+1) = -999;
    T(N,:,k+1) = -999;
    T(:,1,k+1) = -999;
    T(:,N,k+1) = -999;
    for i = 2:N-1
        for j = 2:N-1
            [open] = Isopen(i,j,N);
            M = sum(open);
            T(i,j,k+1) = T(i,j,k)*(1-w)+w/M*([T(i-1,j,k),T(i+1,j,k),T(i,j-1,k),T(i,j+1,k)]*open);
        end
    end
end
lake = T; %sets lake equal to T
%plotting
surfc(lake);
end
function [open] = Isopen(row,col,N)
%initialize open
open = ones(4,1);
%row and col values/concention for directions
%if statement
if row == 2
    open(1,1) = 0; %up
elseif row == N-1
    open(2,1) = 0; %down
elseif col == 2
    open(3,1) = 0; %left   
elseif col == N-1
    open(4,1) = 0; %right 
end
end

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Answer 1

Walter Roberson 2019-4-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/458391-plotting-a-matrix-using-surfc#answer_372180

Your T is created as 3 dimensional. You are trying to surfc() a 3D volume. surfc() and surf() are only for 2D arrays (on a plane that might be warped.)

You can use isosurface() or you can use slice(). Or you can use the volumeViewer() app. Or you can use vol3d v2 from the File Exchange.

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Brian Peoples 2019-4-25

My homerwork says:

Plot the surface of lake using a 3-D contour plot. Comment on how it looks at the bottom of your main function before your subfunction. Use the surfc function to make this plot.