How to change the x-axis so you only view the image (axistight)?

Hi! I am looking how I can change my x-axis limits so I will only view the area of interest on the figure?

The code below is used: To load the data: for i = 1:10; c3dFile_i = sprintf('GaitData_subject_%d.c3d',i); [Markers(i).subject,MLabels(i).subject,VideoFrameRate(i).subject,AnalogSignals(i).subject,ALabels(i).subject,AUnits(i).subject,AnalogFrameRate(i).subject,Event(i).subject,ParameterGroup(i).subject,CameraInfo(i).subject]=readC3D(c3dFile_i); end

To plot the GRF: for i = 1:10 fs = 1000; if i==1 i==2 i==3 i==8 i==10 for j = 1:3 GRF_i = abs(AnalogSignals(i).subject(:,j)); n = 2; fcutoff = 5; Wn = fcutoff/(fs/n); [B,A] = butter(n,Wn,'low'); GRF_filt = filtfilt(B,A,GRF_i);

            figure(i);
            xlim([0 xlabel_end(n)]);
            subplot(3,1,j);
            plot(GRF_filt, 'b', 'LineWidth', 1);
            xlabel('time[s]');
            for n = 1:10
                xlabel_end(n) = length(AnalogSignals(n).subject)/1000;
            end
            ylabel('F[N]');
            if j == 1
                title(['x component of filtered GRF of subject ', num2str(i)]);
            elseif j == 2
                title(['y component of filtered GRF of subject ', num2str(i)]);
            else
                title(['z component of filtered GRF of subject ', num2str(i)]);
            end
        end
    else
        GRF_i = abs(AnalogSignals(i).subject(:,25:27));
        for k = 25:27
            n = 2;
            fcutoff = 5;
            Wn = fcutoff/(fs/n);
            [B,A] = butter(n,Wn,'low');
            GRF_filt = filtfilt(B,A,abs(AnalogSignals(i).subject(:,k)));

            figure(i);
            subplot(3,1,(k-24));
            plot(GRF_filt, 'b', 'LineWidth', 1);
            xlabel('time[s]');
            for n = 1:10
                xlabel_end(n) = length(AnalogSignals(n).subject)/1000;
            end
            ylabel('F[N]');
            if j == 1
                title(['x component of filtered GRF of subject ', num2str(i)]);
            elseif j == 2
                title(['y component of filtered GRF of subject ', num2str(i)]);
            else
                title(['z component of filtered GRF of subject ', num2str(i)]);
            end
        end
    end
end

Thanks in advance if anyone could help!

Answer 1

[Benjamin Kraus]

There are a few ways to change the x-axis limits:

xlim([-inf inf]) % Fit the x-limits tight to the data.
axis tight % Fit x, y, and x-limits tight to the data.
xlim([0 xlabel_end(n)]); % Hard-code the limits

That last command is copied from your code, but you are setting the limits before you plot instead of after you plot. The plot command resets the axes properties (including the limits) to the default values. If you move the call to xlim after the call to plot, I think you will get the desired effect.

subplot(3,1,j);
plot(GRF_filt, 'b', 'LineWidth', 1);
xlim([0 xlabel_end(n)]);

[Lore Vleugels]

Hi! Thank you very much for your extensive answer! I have tried all three options, but none of them change the axis limits of the x-axis unfortunately. If I run the code, I still get the same image as shown below. I need the range from approximately 750ms till 1600ms. Is there another way to change the axis limits?

[Benjamin Kraus]

If you need specific limits, then just provide those as input to xlim:

xlim([750 1600])