I am getting the following error on using pcolor() fucntion:??? Error using ==> surface Value must be numeric Error in ==> pcolor at 76 hh = surface(x,y,zeros(size(c)),c,'parent',cax);

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Nishant Shankhwar 2016-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/272617-i-am-getting-the-following-error-on-using-pcolor-fucntion-error-using-surface-value-must-b

编辑： Walter Roberson 2016-3-11

采纳的回答： Mike Garrity

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Code is as follows:

% Defining Grid
Sx = 1;     % physical size along x 
Sy = 1;     % physical size along y
Nx = 10;    % number of cells along x 
Ny = 10;    % number of cells along y
% A CIRCLE
% Grid Arrays
dx = Sx/Nx; 
xa = [0:Nx-1]*dx;
xa = xa - mean(xa);
dy = Sy/Ny; 
ya = [0:Ny-1]*dy;
ya = ya - mean(ya);
% Create Circle
r     = 0.4;
[Y,X] = meshgrid(ya,xa);
A     = zeros(Nx,Ny);
A     = (X.^2 + Y.^2) <= r^2;
figure();
pcolor(xa,ya,A');

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采纳的回答

Mike Garrity 2016-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/272617-i-am-getting-the-following-error-on-using-pcolor-fucntion-error-using-surface-value-must-b#answer_213112

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It's trying to say that it doesn't like the type 'logical'. That's what you got when you did this:

A = (X.^2 + Y.^2) <= r^2;

Probably the simplest fix would be:

pcolor(xa,ya,double(A'))

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Nishant Shankhwar 2016-3-11

编辑：Walter Roberson 2016-3-11

This fixed the problem. Thanks!

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