# How display a log space bar figure ?

1 view (last 30 days)
Mallouli Marwa on 25 Jan 2020
Answered: Akira Agata on 25 Jan 2020
Hi I have plotted a bar figure but I want that the y axis log space.
Please can you rectify my code.
clear all
clc
maxV_l = [0.015232 0.020273 0.0069196 0.012027 0.010313 0.012567 0.014836 0.015071 0.016182 0.018388 0.013878];
maxV_m = [12.911 15.205 6.6378 10.659 9.3996 11.026 12.564 12.685 13.418 14.511 12.082];
maxV_h = [ 166.73 138.81 167.74 148.64 146.5 155.99 149.72 162.55 172.41 166.32 154.67];
% Create a vertical bar chart using the bar function
figure (1)
bar(1:11, [maxV_l' maxV_m' maxV_h'],1)
% Set the axis limits
set(gca,'xticklabel',{'PZT-5A','PZT-5H','PZT-7A','PZT-4','PZT-8','APC-8740','APC-850','SONOX-P504','SONOX-P508','PIC-151','PIC-255'});
% Add title and axis labels
xlabel('Material')
ylabel('|Peak Voltage| [V/g]')
legend('Rl=100\Omega', 'Rl=100k\Omega', 'Rl=10M\Omega')

Stephan on 25 Jan 2020
% Set y-axis to log scale
set(gca, 'YScale', 'log')

Akira Agata on 25 Jan 2020
Please set YScale property of the axes to 'log'.
The following is an example.
maxV_l = [0.015232 0.020273 0.0069196 0.012027 0.010313 0.012567 0.014836 0.015071 0.016182 0.018388 0.013878];
maxV_m = [12.911 15.205 6.6378 10.659 9.3996 11.026 12.564 12.685 13.418 14.511 12.082];
maxV_h = [ 166.73 138.81 167.74 148.64 146.5 155.99 149.72 162.55 172.41 166.32 154.67];
% Create a vertical bar chart using the bar function
figure
bar([maxV_l' maxV_m' maxV_h'],1)
ax = gca;
ax.XTickLabel =...
{'PZT-5A','PZT-5H','PZT-7A','PZT-4','PZT-8','APC-8740','APC-850','SONOX-P504','SONOX-P508','PIC-151','PIC-255'};
ax.XTickLabelRotation = 45;
ax.YScale = 'log';
ax.YLim(2) = 1e4; % To make additional space for a legend
% Add title and axis labels
xlabel('Material','FontSize',12)
ylabel('|Peak Voltage| [V/g]','FontSize',12)
legend('Rl=100\Omega', 'Rl=100k\Omega', 'Rl=10M\Omega')

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