right triangle area within a certain tolerence

How do I write a matlab code that uses a user defined function to determine the area of all right triangles with sides ranging from 0 to 3 inchs in .5 inch increments. I want to do it with 2 for loops and an if statement to flag all triangles with an area tollerence of .3 in^2 with the area being a UDF. Below is the code i have so far.

for b=0:.5:3
    for h=0:.5:3
        A=Area_tri(b,h)
        if A=.3
            disp("A is .3")
        end
    end
end

[Bob Thompson]

What problems are you having? What you have seems like it could work for what you have stated you want to do.

[ian flanagan]

It doesnt cycle throgh and give me a list of areas with .3 though

Answer 1

[John D'Errico]

You have two problems in one line. Worse, you have two problems virtually within the same character. Hey, that could be a record. ;-)

if A=.3

You write that "test".

First, A=.3 is NOT a test. MATLAB uses = to assign something to a variable. So you would write

A = 0.3;

to assign the value 0.3 to A.

If you want to test for EXACT equality, you use == not = for the test.

So your first problem was the test for quality. But that is also your second problem. You should NEVER test for exact equality to a floating point number. MATLAB does not store the number 0.3 as an exact decimal. Instead, you should test for approximate equality. So you might do this instead:

if abs(A - 0.3) < eps
  disp("A is reasonably close to 0.3.")
end