Vertically displace Data on a Log Graph

Hello, I have lots of data I would like to vertically displace for comparison. My yaxis values are between 1 and 0 dropping off exponentially and so y data is displayed on a log graph with error bars. The data is saved in many matrices named; x19946ALLTrans2 , x19946ALLTrans4, x19946ALLTrans6...

Here is my code:

figure1 = figure;

axes1 = axes('Parent',figure1,'YScale','log','YMinorTick','on');

box(axes1,'on');

hold(axes1,'all');

for i=4:2:18

    hold on

dataname=strcat('x19946ALLTrans',num2str(i));

data=eval(dataname);

errorbar((data(:,1)),(data(:,2)),(data(:,3)))

xlabel('$Q(\AA^{-1})$','Interpreter','Latex','fontsize',18); ylabel('Reflectivity','FontSize',20);

legend1 = legend(axes1,'show');

set(legend1,'FontSize',14);

set(gcf,'Color','white');

hold on

end

Answer 1

[Star Strider]

I would simply multiply them by the constant of your choice. That will vertically displace them on a semilogy plot. It should not affect the calculated values of the error bars, or their magnitude on the plot.

To illustrate:

x = 0:10;
y = 2*exp(-0.1*x) + 1;

figure(1)
semilogy(x, y)
errorbar(x, y, ones(size(x)))
hold on
semilogy(x, y*3)
errorbar(x, y*3, ones(size(x)))
hold off
axis([xlim    0  11])
grid

[ShabirR]

Thanks!

[Star Strider]

My pleasure.

You can also just add an arbitrary constant to get the same effect:

x = 0:10;
y = 2*exp(-0.1*x) + 1;

figure(1)
semilogy(x, y)
errorbar(x, y, ones(size(x)))
hold on
semilogy(x, y+3)
errorbar(x, y+3, ones(size(x)))
hold off
axis([xlim    0  11])
grid