bining x in plots

Hi,

I have a problem regarding bining x axis in a plot.

I have an array that I want to plot it. In biochemistry is cardinality of reactions.

Then my boss asked me:

"x axis should be binned and put into log10 scale to show linear relationship. I think you need to create bins on the x scale, equally spaced in log scale, then the value of each bin is the number of reactions with cardinality between an interval on log scale. This code may help...

https://uk.mathworks.com/matlabcentral/fileexchange/27176-log-binning-of-data.

But I do not know how to plot is in the way that we see linearity with bining x logarithmly?

I would be appricaite if someone could guide me?

Best regards,

Susan

[darova]

There is sparse matrix with some values in the attached file. What do they represent?

[Susan Ghaderi]

this is a sparse array, which represent the cardinality of some reactions. First I should ordered them and then plot them. Then

I use this peice of code:

load('card.mat')

s=-sort(-d)

plot(log10(s),'*')

then I got the above figure.

But what I need to do, is to bin x logarithmically and then again plot it to get a linear plot.

In I want to make it simple if we have an m by n matrix, S, which m is the number of rows, and n is the number of columns this vector, d= sum(S~=0). Now, d represent how many nonzero elements are in each column.

[darova]

You mean this?

x = log10(1:n);
plot(x,s)

[Susan Ghaderi]

No, I do not think so. Becasue it does not show something linear.I guess he means something like figure 5 in this link https://arxiv.org/pdf/1011.1533.pdf

But I do not know how to get that.

Answer 1

[Siriniharika Katukam]

Hi

Try replacing

plot(x,y) 

to

semilogx(x,y)

‘semilogx’ turns the x-axis to a Logarithmic scale as in the figure that you provided in the above commented link. Further details can be got from this link:

https://www.mathworks.com/help/matlab/ref/semilogx.html

and for logarithmic scale on y-axis, use ‘semilogy’.