Labeling Minor Tick Marks in Plots

Question

Abed Alnaif 2011-10-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/17559-labeling-minor-tick-marks-in-plots

Hi, I am trying (without success) to find a way to automatically label the minor tick marks in a plot -- specifically, a semi-log-y plot. I thought that I would be able to do this using the get(gca,...) command to obtain the locations of the minor tick marks, and then the set(gca,'YTick',...) command to set the minor ticks as major ticks. However, I wasn't able to figure out how to obtain the locations of the minor ticks using the get(gca,...) command. Please let me know if you have a solution. An example code is shown below:

function label_minor_ticks()
    figure
    y = [0.4,0.5,0.8,1,1.5,2,4];
    semilogy(y);
end

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Answer 1

Grzegorz Knor 2011-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/17559-labeling-minor-tick-marks-in-plots#answer_23679

在 MATLAB Online 中打开

Remove YMinorTicks, and add new YTicks:

y = [0.4,0.5,0.8,1,1.5,2,4];
semilogy(y);
set(gca,'yMinorTick','off')
yRange = get(gca,'ylim');
p = ceil(log(yRange) / log(10));%nextpow10
ticks = [];
for k=p(1):p(2)
    if k==p(1)
        ticks = [ticks yRange(1):10^(k-1):10^k];
    elseif k==p(2)
        ticks = [ticks 10^(k-1)+10^(k-1):10^(k-1):yRange(2)];
    else
        ticks = [ticks 10^(k-1)+10^(k-1):10^(k-1):10^(k-1)];
    end
end
set(gca,'ytick',ticks(2:end-1))

This loop does not look good for me, but it works :)

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Answer 2

Abed Alnaif 2011-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/17559-labeling-minor-tick-marks-in-plots#answer_23787

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Thanks! I thought that there would be an easier way. I noticed one minor error in your solution, and I made a few other minor changes:

figure
y = [0.32,0.4,0.5,0.8,1,1.5,2,4,4.5,9.9,10.5];
semilogy(y);
set(gca,'yMinorTick','off')
min_y = min(y);
max_y = max(y);
most_sig_position_min = 10^floor((log10(min_y)));
most_sig_digit_min = floor(min_y / most_sig_position_min);
min_yaxis = most_sig_digit_min * most_sig_position_min;
most_sig_position_max = 10^floor((log10(max_y)));
most_sig_digit_max = ceil(max_y / most_sig_position_max);
max_yaxis = most_sig_digit_max * most_sig_position_max;
p(1) = ceil(log10(min_yaxis));
p(2) = ceil(log10(max_yaxis));
ticks = [];
for k=p(1):p(2)
    if k==p(1)
        ticks = [ticks min_yaxis:10^(k-1):10^k];
    elseif k==p(2)
        ticks = [ticks 10^(k-1)+10^(k-1):10^(k-1):max_yaxis];
    else
        ticks = [ticks 10^(k-1)+10^(k-1):10^(k-1):10^k];
    end
end
set(gca,'ytick',ticks())
axis([-Inf Inf min_yaxis max_yaxis])