multiple logarithmic x-axes

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Mos_bad
Mos_bad 2019-7-17
编辑： Tommy 2020-4-8
I need to draw two plots with multiple logarithmic axes in the same figure. For clarification, I want two log-axes (one on top one in bottom) with the same y axis scale. attached is the current plot I got. I need to separate mu_s and mu_d axes.
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Mos_bad
Mos_bad 2019-7-17
attached is the plot. I want to plot it with multiple x-axes. I mean to separate mu_s and mu_d

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回答（1 个）

Shashank Sharma
Shashank Sharma 2019-7-17
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Xiaozhun Tang
Xiaozhun Tang 2020-4-8
@Shashank Sharma
This is the figure by your code, you can see that the top axis is not logarithmic, how to solve this?
Tommy
Tommy 2020-4-8
编辑：Tommy 2020-4-8
From reference for semilogx:
"If you attempt to add a loglog, semilogx, or semilogy plot to a linear axis mode graph with hold on, the axis mode remains as it is and the new data plots as linear."
If you take away the hold on call, however, all axes properties other than position or units will be reset upon plotting. (See NextPlot documentation and this line from hold documentation:
"The hold function sets these properties:
  • NextPlot axes property - Sets this property of the associated Axes, PolarAxes, or GeographicAxes object to either 'add' or 'replace'.").
One option is to set the axes properties after plotting:
x = 0:1000;
y = log10(x);
semilogx(x,y);
ax1 = gca;
ax1_pos = ax1.Position;
ax2 = axes('Position',ax1_pos);
x = 0:1000;
y = 2*log10(x);
semilogx(ax2,x,y);
set(ax2, 'XAxisLocation', 'top');
set(ax2, 'Color', 'none');
ax1.YLim = max(ax1.YLim, ax2.YLim);
Another option, if you don't want to have to reset the axes properties every time you add a new plot to the axes, or if you do want the ability to add multiple plots to ax2, is to set the XScale of ax2 to 'log':
x = 0:1000;
y = log10(x);
semilogx(x,y);
ax1 = gca;
ax1_pos = ax1.Position;
ax2 = axes('Position',ax1_pos,...
'XAxisLocation', 'top',...
'Color','none',...
'XScale', 'log',...
'NextPlot', 'add'); % set NextPlot to 'add' so that the above properties are not reset.
x = 0:1000;
y = 2*log10(x);
plot(ax2,x,y);
ax1.YLim = max(ax1.YLim, ax2.YLim);

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