How do I create a graph similar to that of the example below?

Answer 1

[Jonas]

you could do like this

loglog([ 10^2 10^2 10^4 10^4 10^2],[ 10^4 10^6 10^6 10^4 10^4]);
hold on;
loglog([ 1 10^2 10^4 10^4],[ 10^2 10^2 10^1 1]);
loglog(10.^([5 6 7 8 5]),[ 10^3 10^5 10^5 10^4 10^3]);

grid on;

axis([1 10^8 1 10^8])

[Devin Perera]

Sorry i should've mentioned. Ive got a range of temperature and a range of pressure for multiple data sets that i need to plot in a nature similar to above.

[Jonas]

can you describe the data and supply the mat file?

[Devin Perera]

I haven't created a MATfile as of yet but the data is as described below:

A - temperature = (10:1:20), pressure = (3:1:4)

B - temperature = (40:1:60), pressure = (1.1)

C - temperature = (5:1:10), pressure = (5:1:10)

So temperature is on the x-axis and pressure is on the y-axis. Resulting in two 'shapes' for A and C and a line for B.

[Devin Perera]

The graph doesnt have to be a log graph as seen in the example, just the same concept showing the shapes.

[dpb]

As @Jonas shows, you can just plot points in sequential order to draw the lines -- each line will be a vector of x,y points from your data.

The perfect rectangle can be done with the rectangle function, the other areas could also be done with patch with no fill...

It'll perhaps be somewhat tedious, but not particularly difficult.

ADDENDUM

NB: You ca put all your data into single X,Y arrays by column -- if there aren't the same number of points to define each line, fill the remainder of the column to make the rectangular array with NaN; plot() will just silently ignore those entries.

This will let you get by with one call to plot() rather than having a long string of duplicated code with a bunch of named variables.

Create a matching array of labels to use for the indentifying text.