MATLAB: Labeling Minor Tick Marks in Plots

log plotsminor tick marksplotssemilog plotstick mark labelstick marks

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

Best Answer

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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