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

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jacob 2014-1-27

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https://ww2.mathworks.cn/matlabcentral/answers/113871-how-can-i-write-a-function-called-triarean-that-computes-the-area-of-n-triangles

评论： AYUSH MISHRA 2020-5-23

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.

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Roger Stafford 2014-1-27

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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采纳的回答

Pedro Villena 2014-1-27

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 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

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jacob 2014-1-27

编辑：jacob 2014-1-27

It says unexpected matlab expression whenever i enter a matrix like triAreaN(1 2 3 ; 4 5 8).

AYUSH MISHRA 2020-5-23

very bad solution

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Amit 2014-1-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/113871-how-can-i-write-a-function-called-triarean-that-computes-the-area-of-n-triangles#answer_122320

在 MATLAB Online 中打开

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;

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jacob 2014-1-27

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.

jacob 2014-1-27

nvm. i got it. thank you so much!

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