Contour Plot when both x & y axis are in logscale

Question

Md Jahid Hasan Sagor 2022-8-19

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https://ww2.mathworks.cn/matlabcentral/answers/1781925-contour-plot-when-both-x-y-axis-are-in-logscale

评论： AD 2023-7-31

Can anyone help me to contour plot when both x & y axis are in logscale? Please see the figure.

I have coded like below but it didn't show logscale in both axis:

f=logspace(-3,0,100);

R0=logspace(-6,-2,100);

[X,Y]=meshgrid(f,R0);

%%%Main code body

....

.....

Z=1+(gamma/(k*d^2))*(f.^2*delL+delR+2*R0.*X.*Gamma_func);

%%%%%%%

contour(X,Y,Z)

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Answer 1

Chunru 2022-8-19

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https://ww2.mathworks.cn/matlabcentral/answers/1781925-contour-plot-when-both-x-y-axis-are-in-logscale#answer_1029095

编辑：Chunru 2022-8-19

[x, y, z] = peaks;

x = x+4; y = y+4; z=z+8; % make it positive

figure

contourf(x, y, z);

colorbar

xlabel('x'); ylabel('y');

figure

%contour(log10(x), log10(y), z);

contourf(log10(x), log10(y), log10(z));

h2 = colorbar;

zt = h2.Ticks;

h2.TickLabels = "10^{"+string(zt')+"}";

% customize ticklabels

xt = xticks;

xticklabels("10^{"+string(xt')+"}");

yt = yticks;

yticklabels("10^{"+string(yt')+"}");

xlabel('x'); ylabel('y');

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Md Jahid Hasan Sagor 2022-8-19

Thank you.But what you plotted is not representing the axis are in logarithm scale.

Chunru 2022-8-19

What do you mean? They are indeed in log scale.

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Answer 2

Alexis Carranza Hidalgo 2023-7-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1781925-contour-plot-when-both-x-y-axis-are-in-logscale#answer_1279872

x = linspace(0,2*pi);

y = linspace(0,4*pi);

[X,Y] = meshgrid(x,y);

Z = sin(X)+cos(Y);

% Plot using contour

figure;

contour(X,Y,Z);

% Use the 'set' command to graph in log scale

set(gca, 'XScale', 'log');

set(gca, 'YScale', 'log');

axis tight; % Adjust the axis limits

xlabel('X');

ylabel('Y');

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AD 2023-7-31

What should we do to set scale to millimeters?

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