How can I plot a huge set of data?

Hi

I have a 45000 *6 matrix, i want plot the 6th colon in function of the 5th colon. i used the function plot:

plot(TOT(:,5),TOT(:,6),'x');

Doing that, Matlab freeze. I've created a submatrix with the two colons i need and i tried again.

A=[TOT(:,5) TOT(:,6)]
plot(A(:,1),A(:,2),'x')

In the beginning it functions and i generated a report with matlab. But, today i want run my code again, it freezes in the plot line .

Does any one have an idea what can I do?

Thanks

[Cedric]

It's rarely useful to have 45,000 points on a plot. Could you bin your data and plot a relevant statistics?

[Haithem Bouziri]

Ma set of data is random, and i need this plot to do a caracterisation

[Walter Roberson]

Binning or sub-sampling should be fine for characterization purposes.

[Haithem Bouziri]

can you explain more please

Answer 1

[Azzi Abdelmalek]

By creating a new matrix A, you are increasing the memory used by Matlab. you can check the memory used by Matlab. Type

memory

Lookt at

http://www.mathworks.com/help/matlab/matlab_prog/strategies-for-efficient-use-of-memory.html

[Haithem Bouziri]

yeah of course but it was strange that it doesn't function with the original Matrix in the begininng

[Azzi Abdelmalek]

At the same time, 45000*6 elements does not occupy a lot of memory, unless your computer performances are very low.

[Haithem Bouziri]

when it functioned it just take 17 second to run all the program. (10 second to load data, 5 second for a function that I create to sort data and take what i need)

[Haithem Bouziri]

I deleted the matrix A, but always the same problem, trying to investigate more, my program freeze starting with 1200 point

[Azzi Abdelmalek]

When you type

memory

what do you get?

[Haithem Bouziri]

nothing, no error message. It freezes, busy and couldn't stop