How can I write a function called triAreaN that computes the area of N triangles?

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The input of the function is a 2xN array where each column of the array contains the base and height of a single triangle. The function returns a 1xN array where the i^th column is the area of the i^th triangle. Test whether the base and height are positive. if either one is negative, set the area of the triangle to zero.
function triAreaN(B1...Bi;H1...Hi);
%H = Height of triangle (B1...Bi)=('enter the base'); (H1...Hi)=('enter the height');
A = (1/2*(B1*H1):1/2*(B1*Bi)); A = ('display answer'); A(output) end
Line 1: invalid syntax at '<EOL>'. Possibly, a ),}, or ] is missing. Line 4: Terminate statement with semicolon to suppress output(in functions). Line 5: invalid syntax at '<EOL>'. Possibly, a ),}, or ] is missing. Line 8: The value assigned to variable A' might be unused.
Homework problem. he never showed us how to use matrices or array in function or how to assign the rows to be certain input values. Stuck here not sure where to go from this point.
  1 Comment
Roger Stafford
Roger Stafford on 27 Jan 2014
It would have been much more interesting if your inputs had been given as the 3D cartesian coordinates of the triangles' vertices rather than their base and height.

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Accepted Answer

Pedro Villena
Pedro Villena on 27 Jan 2014
function A = triAreaN(B,H)
if numel(B)==numel(H),
A = 0.5*(B.*H);
else
error('B and H must be same length');
end

More Answers (1)

Amit
Amit on 27 Jan 2014
function A = triAreaN(Ar)
% Ar is 2XN array where each column is base and height
A = 0.5*Ar(1,:).*Ar(2,:);
A(Ar(1,:) < 0 | Ar(2,:) < 0) = 0;
  7 Comments
jacob
jacob on 27 Jan 2014
so would i type it in the command window or run it as triAreaN(1 2 3 ; 4 5 6) or does it need brackets? either way i do it it sayunexpected expression or unexpected parenthesis or bracket.

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