How to plot log-scale with number ?

Question

Jeevan Kumar Bodaballa 2020-6-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/544079-how-to-plot-log-scale-with-number

评论： Jeevan Kumar Bodaballa 2020-6-8

采纳的回答： Tommy

How can I plot log scale with the numbers like below image ?

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Answer 1

Tommy 2020-6-8

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https://ww2.mathworks.cn/matlabcentral/answers/544079-how-to-plot-log-scale-with-number#answer_447770

在 MATLAB Online 中打开

Maybe something like this?

% data:
X = 2*logspace(1, 3, 100);
Y = rand(100,1);
% labels to keep:
labels = [20 30 50 70 100 200 300 500 1000 2000];
% prepare axes, plot:
ax = axes('XScale', 'log', 'NextPlot', 'add');
plot(ax, X, Y, '.')
ax.XLim = [20 2000];
ax.XAxis.TickDirection = 'out';
% steal the tick locations from the minor ticks, then turn the minor ticks off:
drawnow
ax.XTick = ax.XAxis.MinorTickValues;
ax.XMinorTick = 'off';
% remove labels we don't want to keep:
ax.XTickLabel(~ismember(ax.XTick, labels)) = {''};

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Jeevan Kumar Bodaballa 2020-6-8

This is working but I'd wonder if we have any optmised code !

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Answer 2

the cyclist 2020-6-8

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https://ww2.mathworks.cn/matlabcentral/answers/544079-how-to-plot-log-scale-with-number#answer_447773

One way is to use the semilogx function.

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the cyclist 2020-6-8

在 MATLAB Online 中打开

There are multiple ways to do this task. Here is one way:

% data:
X = 2*logspace(1, 3, 100);
Y = rand(100,1);
% Locations of the ticks (and also how we want them labeled)
tickLoc = [20 30 50 70 100 200 300 500 1000 2000];
% Create a new figure window, and plot the data with log x-axis
figure
semilogx(X,Y);
% Set the axis limit, tick locations and labels
set(gca, ...
    'XLim',[20 2000], ...
    'XTick', tickLoc, ...
    'XTickLabel',tickLoc);

Tommy's solution and mine are doing effectively the same thing (although I did not do all the little things he did like make the tick marks point outward). The biggest difference is that I used the semilogx command, where he created the axes first, and then set the 'XScale' property to 'log'.

Jeevan Kumar Bodaballa 2020-6-8