Why does not semilogy works?

Printing semilogy and loglog and the gca indicate that no log x- or y-scale ar set

XScale: 'linear'

YScale: 'linear'

Do I have to go into the gca everyttime I would like to plot a log figure?

[Jan]

Please post the corresponding code. It is not clear, what "go into gca" means.

[Ove Gustafsson]

Thank you for the answer. Down below you see an example of the type of simple code. I guess that you understand the meaning.

figure(1);

hold on

nnmax= size(data.file,1);

for kk=1:1:nnmax

semilogy(data.x(:,kk), data.y(:,kk));

end

hold off

I understand that I have to move the "hold on" comand somewhere. It works when I give the comand for the first line infront of the for-loop. The simple test with an other version works, code as you see below.

figure(2);

nnmax= size(data.file,1);

kk=1;

semilogy(data.Wavelength(1:data.numberline(kk),kk), data.Reflex(1:data.numberline(kk),kk));

hold on

for kk=2:1:nnmax

semilogy(data.Wavelength(1:data.numberline(kk),kk), data.Reflex(1:data.numberline(kk),kk));

end

hold off

Answer 1

[Walter Roberson]

loglog() and semilogy() and semilogx() have no effect if "hold on" is already in effect for the axes. You cannot mix log coordinates and linear coordinates in the same axes.

[Ove Gustafsson]

Thank you for this information!

Best regardes

Ove