我是没仔细看code啦 只是我想建议 平面座标三个点构成的三角形面积 (a,b) (c,d) (e,f) = (1/2)*| a b 1 | | c d 1 | | e f 1 | (这个是行列式值) 应该这样直接给matlab算 就会得到了 若是太多根号 浮点运算会产生很多误差....... ※ 引述《royt (Engineer)》之铭言： : 问题是输入三个座标点 : 算出三点所围成的三角形面积 : 我先用把两点的距离分别算出来 : 再带入海龙公式 : % MS2013 HW#1: To caculate the area of the triangular : function area = func_hw1(x1,y1,x2,y2,x3,y3) : % print the position : fprintf('The first point of the triangle is (%5.2f, %5.2f)\n', x1, y1) : fprintf('The second point of the triangle is (%5.2f, %5.2f)\n', x2, y2) : fprintf('The third point of the triangle is (%5.2f, %5.2f)\n\n', x3, y3) : % calculate the distance between points : distance_12 = sqrt( (x1 - x2)^2 + (y1 - y2)^2 ); : distance_13 = sqrt( (x1 - x3)^2 + (y1 - y3)^2 ); : distance_23 = sqrt( (x2 - x3)^2 + (y2 - y3)^2 ); : % put the distance into Helen formula : temp = (distance_12 + distance_13 + distance_23)/2; : area = sqrt( temp * (temp - distance_12) * (temp - distance_13) * (temp - : distance_23) ); : fprintf('The area of the triangle is %7.2', area) : % end : 可是测出来误差过大 http://ppt.cc/d4sK : 请问是哪个地方出问题吗? --

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