MATLAB: Coloring region of inequalities on matlab

#matlab #regioncolorMATLAB

I would like to color the region for the inequalities listed: 0.00383p + 0.804t > -1250; 0.00383p + 0.804t < 1500. How can I color the region with respect to these inequalities in a 2D coordinate system of t vs. p?

Best Answer

Download plotregion from the file exchange. It does exactly what you want. Although, I should point out that this is an unbounded region. Two inequalities are insufficient to bound a region in the plane. As it is, these are parallel lines, so the region extends to infinity in either direction, unless there are also other constraints, perhaps positivity of the variables.

Alternatively, it is trivial to create a polygon that goes out as far as you wish. Then just use patch.

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MATLAB: Coloring

I would use contour with specification of level and combine with hold on.

Take al look to the documentation

http://www.mathworks.de/help/techdoc/ref/contour.html

contour(Z,v) draws a contour plot of matrix Z with contour lines at the data values specified in the monotonically increasing vector v. The number of contour levels is equal to length(v). To draw a single contour of level i, use contour(Z,[i i]). Specifying the vector v sets the LevelListMode to manual to allow user control over contour levels.

MATLAB: Inequality problem

You have to split them up... instead of:

A < X < B

you have to do:

(A < X) && (X < B)

Incidentally, make sure you are using good logic. At your first if you have:

0.00 > X < 0.25

which is the same(*) as saying:

(X < 0.0) && (X < 0.25)

The second part is redundant, because if X is less than 0.0 it is also less than 0.25

(*) By saying "same" I mean the way you would interpret the statement. Matlab executes those two statements very differently.

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