The mesh function is not working for me in offline Matlab, but when I check this code in online Matlab, it works. What is the reason?

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Kuvon 2025-1-26

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评论： Star Strider 2025-1-28

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Kuvon 2025-1-27

编辑：Kuvon 2025-1-27

function [] = app()

X = pi;

T = pi/2;

a = 1;

m = 80;

n = 40;

k = 120;

h_p = X / m;

x_p = linspace(0, X/2, m + 1);

t_p_c = linspace(0, T/4, floor(n/2) + 1);

t_p_f = linspace(T/4, T/2, 2*k);

tau_p = t_p_c(2) - t_p_c(1);

tau_f = t_p_f(2) - t_p_f(1);

u0 = sin(x_p);

v_p = zeros(m + 1, length([t_p_c t_p_f(2:end)]));

g1 = @(t) -sin(6*t);

g2 = @(t) sin(1/2*t);

v_p(:, 1) = u0;

v_p(:, 2) = u0;

for j = 2:length(t_p_c) - 1

v_p(1, j + 1) = g1(t_p_c(j + 1));

v_p(end, j + 1) = g2(t_p_c(j + 1));

for i = 2:m

v_p(i, j + 1) = a^2 * (tau_p / h_p)^2 * (v_p(i - 1, j) - 2 * v_p(i, j) + v_p(i + 1, j)) - v_p(i, j - 1) + 2 * v_p(i, j);

end

offset = length(t_p_c);

for t = 1:length(t_p_f) - 1

idx = offset + t;

v_p(1, idx) = g1(t_p_f(t + 1));

v_p(end, idx) = g2(t_p_f(t + 1));

for i = 2:m

v_p(i, idx) = a^2 * (tau_f / h_p)^2 * (v_p(i - 1, idx - 1) - 2 * v_p(i, idx - 1) + v_p(i + 1, idx - 1)) - v_p(i, idx - 2) + 2 * v_p(i, idx - 1);

end

total_time = [t_p_c t_p_f(2:end)];

figure;

mesh(total_time, x_p, v_p);

xlabel('T');

ylabel('X');

zlabel('u(x,t)');

end

----------------Can you please check this code, I still have a problem.

Torsten 2025-1-27

编辑：Torsten 2025-1-27

在 MATLAB Online 中打开

What do you get as output if you type

which error -all
built-in (/MATLAB/toolbox/matlab/lang/error)
/MATLAB/toolbox/matlab/connector2/logger/+connector/+internal/Logger.p  % connector.internal.Logger method
built-in                                                                % gpuArray method
which mesh -all
/MATLAB/toolbox/matlab/graphics/graphics/graph3d/mesh.m

Did you somewhere create your own function mesh.m or error.m ? Then rename it / them .

Kuvon 2025-1-27

Thank you very much, I fixed them, the mathlab is working now.

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回答（1 个）

Star Strider 2025-1-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2173331-the-mesh-function-is-not-working-for-me-in-offline-matlab-but-when-i-check-this-code-in-online-matl#answer_1558213

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Star Strider 2025-1-27

在 MATLAB Online 中打开

Sure!

It seems to work correctly here —

X = pi;

T = pi/2;

a = 1;

m = 80;

n = 40;

k = 120;

h_p = X / m;

x_p = linspace(0, X/2, m + 1);

t_p_c = linspace(0, T/4, floor(n/2) + 1);

t_p_f = linspace(T/4, T/2, 2*k);

tau_p = t_p_c(2) - t_p_c(1);

tau_f = t_p_f(2) - t_p_f(1);

u0 = sin(x_p);

v_p = zeros(m + 1, length([t_p_c t_p_f(2:end)]));

g1 = @(t) -sin(6*t);

g2 = @(t) sin(1/2*t);

v_p(:, 1) = u0;

v_p(:, 2) = u0;

for j = 2:length(t_p_c) - 1

v_p(1, j + 1) = g1(t_p_c(j + 1));

v_p(end, j + 1) = g2(t_p_c(j + 1));

for i = 2:m

v_p(i, j + 1) = a^2 * (tau_p / h_p)^2 * (v_p(i - 1, j) - 2 * v_p(i, j) + v_p(i + 1, j)) - v_p(i, j - 1) + 2 * v_p(i, j);

end

offset = length(t_p_c);

for t = 1:length(t_p_f) - 1

idx = offset + t;

v_p(1, idx) = g1(t_p_f(t + 1));

v_p(end, idx) = g2(t_p_f(t + 1));

for i = 2:m

v_p(i, idx) = a^2 * (tau_f / h_p)^2 * (v_p(i - 1, idx - 1) - 2 * v_p(i, idx - 1) + v_p(i + 1, idx - 1)) - v_p(i, idx - 2) + 2 * v_p(i, idx - 1);

end

total_time = [t_p_c t_p_f(2:end)];

figure;

mesh(total_time, x_p, v_p);

xlabel('T');

ylabel('X');

zlabel('u(x,t)');

●

It also works correctly when I run it offline on my computer.

Kuvon 2025-1-27

ooooooo Thank you very much, I fixed them, the mathlab is working now.

Star Strider 2025-1-28

My pleasure!

If my Answer helped you solve your problem, please Accept it!

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The mesh function is not working for me in offline Matlab, but when I check this code in online Matlab, it works. What is the reason?

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The mesh function is not working for me in offline Matlab, but when I check this code in online Matlab, it works. What is the reason?

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