How to use two different scales on one same axis: logarithmic from 0.1 to 1 and linear from then on

I'm trying to reproduce the graphic below. I've got all the data but I don't manage to set the x-axis scale to reproduce the same display: logarithmic scale from 0.1 - 1 and linear from 1-4

Currently using Matlab 2012.a

Answer 1

[Joan Sngl]

Hey problem solved. I've plotted the points with x axis logarithmic and the results are enough good so no need to worry more about this question.

Thanks for the help.

[Youssef Khmou]

ok great, you used semilogx ? same figure as original?

Answer 2

[Youssef Khmou]

hi, Joan

The well known functions for plotting data with logarithmic scales are :

semilogx,semilogy, and loglog for both x and y axis .

lets try a way out :

Suppose Y data has N elements

 >>N=length(Y);
 >>x=linspace(0.1,4,N); % Linear vector of N points from 0.1 to 4.
 >>indx=find(x==1.00);
 % Now make the first portion logarithmic 
 >>x(1:indx)=log10(x(1:indx)); % plot(x) has two parts Log +Lin

Try this generated x axis and see.......

[Youssef Khmou]

Depending on the length N , indx may by "empty matrix" then try to find manually the position where x is approx 1 .

[Joan Sngl]

Thanks for the replay but I'm afraid this is not what I'm looking for. I already have the set of data points (X and Y) but I don't manage to represent them like in the first figure where the AXIS scale goes logarithmic from 0.1 to 1 and linear from 1-4.

This is how it looks like using normal plot function: