X label cuts off in logscale

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Niklas Kurz 2021-1-28

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https://ww2.mathworks.cn/matlabcentral/answers/729428-x-label-cuts-off-in-logscale

评论： Star Strider 2021-6-8

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I assume the x numbers are not shown beacause the plot is squeezed too tight. How to fix it?

f = 1:0.01:20000;
db = zeros(length(f),1);
X = [f' db]; %StarStrider colormap
cm = colormap(jet);                                           
X(end,2) = NaN;                                            
c = (X(:,1));           
p1 = plot(f,db,'b');
p2 = patch(X(:,1), X(:,2), c, 'EdgeColor','interp','LineWidth',4);
set(gca, 'XScale', 'log')
set(gca, 'FontSize',24)
legend('Frequenzgang einer idealen Box')
xlabel('Frequenz in Hz','Interpreter','latex')
ylabel(' Lautstaerke in dB','Interpreter','latex')
axis([1 20000 -20 20])
grid on

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Niklas Kurz 2021-1-28

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I I want to custom xticks it gives me error and closest match:

/Applications/MATLAB_R2020a.app/toolbox/matlab/graph3d/xticklabels.m

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Star Strider 2021-1-28

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https://ww2.mathworks.cn/matlabcentral/answers/729428-x-label-cuts-off-in-logscale#answer_608823

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I do not understand what you want for the x-tick labels.

First, run your code with this to see what it does, and then adapt this to do what you want:

set(gca, 'XTick',logspace(0, log10(20000), 5), 'XTickLabel',1:5)

In general, it is necessary to define both the tick locations themselves, and the tick labels.

The labels can also be text (character arrays) or strings as cell arrays. That is sllightly more complicated, so I will not discuss it now, however I can help you with it if that is what you want to do.

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Star Strider 2021-6-7

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Thank you!

Wow! That’s three years old, so I’m not surprised that I didn’t remember the details.

In that code ‘X’ is a (51x2) matrix. The last value in the second column (or the last values in the matrix) is set to NaN in order to create the line. (If that line is removed from the code, it plots a filled patch object between the curve and the y-origin (y=0) line.

Do that experiment to see the result:

X = [(0:50)' sin((0:50)*pi/10)']; % Create ‘X’

X(end,:) = NaN; % Set Last Value To ‘NaN’ To Create Line

c = flipud(X(:,1)); % Define Colours To Scale With ‘X(:,1)’

figure

patch(X(:,1), X(:,2), c, 'EdgeColor','interp')

cm = colormap(turbo); % Approximates Spectrum

title('Ending ‘NaN’ Creates A Line')

compared to:

X = [(0:50)' sin((0:50)*pi/10)']; % Create ‘X’

% % X(end,:) = NaN; % Set Last Value To ‘NaN’ To Create Line

c = flipud(X(:,1)); % Define Colours To Scale With ‘X(:,1)’

figure

patch(X(:,1), X(:,2), c, 'EdgeColor','interp')

cm = colormap(turbo); % Approximates Spectrum

title('Full Vector Creates A Filled Patch')

I corrected that code a bit, and bookmarked that URL so that I can refer to it more easily in the future.

Niklas Kurz 2021-6-8

编辑：Niklas Kurz 2021-6-8

Thank you for laying emphasis on that difference. It still is a secret to my why that one line (NaN) causes Matlab to reduce patch to just the plotted line. It seems like the refecrence point is mimiced by the data points this way. What is kind of what we wanted.