matrix is singular to working precision , Contour not rendered for non-finite ZData

Question

idan 2022-7-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1765080-matrix-is-singular-to-working-precision-contour-not-rendered-for-non-finite-zdata

回答： Shivam 2023-10-5

Hello,

I have read through all the trouble shooting advice on this website for the above error. I have attached my code, and I am not sure what I am doing that is causing this error.

Could somebody guide me what I am doing wornk?

Thanks.

function [] = Plot3D(cellArray,charArray)

x = linspace(-15,15,100);

y = linspace(-15,15,100);

[xx,yy] = meshgrid(x,y);

z = (sin(sqrt(xx .^2 + yy .^2)))/(sqrt(xx .^2 +yy .^2));

switch charArray

case 'surfc'

surfc(xx,yy,z);

xlabel(cellArray{2});

ylabel(cellArray{4});

zlabel(cellArray{6});

case 'surf'

surf(xx,yy,z);

grid on;

title("This is the surf:");

case 'contour'

grid on;

contour(xx,yy,z,'ShowText','on');

axis([-15 15 -15 15 -15 15]);

otherwise

subplot(2,2,1);

surfc(xx,yy,z);

subplot(2,2,2);

surf(xx,yy,z);

subplot(2,2,[3,4]);

contour(xx,yy,z);

end

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Abderrahim. B 2022-7-21

Hi!

Please, share the error. And if possible, share cellArray and charArray.

Thanks

idan 2022-7-21

Hello,

This is the error:

Warning: Matrix is singular to working precision.

Warning: Contour not rendered for non-finite ZData

Warning: Matrix is singular to working precision.

Warning: Contour not rendered for non-finite ZData

Warning: Matrix is singular to working precision.

Warning: Contour not rendered for non-finite ZData

And this is the code I am trying to run:

load('cellArray.ma'); % something that I load from my computer to see if the function working.

figure('Name', 'surfc')

Plot3D(cellArray, 'surfc')

figure('Name', 'surf')

Plot3D(cellArray, 'surf')

figure('Name', 'contour')

Plot3D(cellArray, 'contour')

figure('Name', 'abc')

Plot3D(cellArray, 'abc')

Thanks.

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Answer 1

Shivam 2023-10-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1765080-matrix-is-singular-to-working-precision-contour-not-rendered-for-non-finite-zdata#answer_1326084

在 MATLAB Online 中打开

Hi @idan,

As per my understanding, you are trying to make different figures using surfc, surf, contour, and plot3, where the provided code's execution is leading to warnings.

You can overcome the warnings by utilizing element-wise division instead of regular division when calculating the variable 'z.' The updated code line would look as follows:

z = (sin(sqrt(xx .^2 + yy .^2)))./(sqrt(xx .^2 +yy .^2));

I hope it helps.