matlab 求曲线与x轴的正负面积之和y=[-61.429,-58.635,-57.02,-54.306,-53.42,-50.796,-49.6,-36.278,35.735,146.684,259.955,332.941,372.657,398.11,387.08,370.301,309.843,242.748,130.381,17.412,-57.716,-80.582,-72.352,-63.972]x=[0:1:23]每个y

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matlab 求曲线与x轴的正负面积之和y=[-61.429,-58.635,-57.02,-54.306,-53.42,-50.796,-49.6,-36.278,35.735,146.684,259.955,332.941,372.657,398.11,387.08,370.301,309.843,242.748,130.381,17.412,-57.716,-80.582,-72.352,-63.972]x=[0:1:23]每个y
matlab 求曲线与x轴的正负面积之和
y=[-61.429,-58.635,-57.02,-54.306,-53.42,-50.796,-49.6,-36.278,35.735,146.684,259.955,332.941,372.657,398.11,387.08,370.301,309.843,242.748,130.381,17.412,-57.716,-80.582,-72.352,-63.972]
x=[0:1:23]
每个y对应个X画的曲线图,然后求在X轴上0—23,曲线所围成的面积,如果光求负的面积或者正的面积又怎么求呢?

matlab 求曲线与x轴的正负面积之和y=[-61.429,-58.635,-57.02,-54.306,-53.42,-50.796,-49.6,-36.278,35.735,146.684,259.955,332.941,372.657,398.11,387.08,370.301,309.843,242.748,130.381,17.412,-57.716,-80.582,-72.352,-63.972]x=[0:1:23]每个y
设步长h=0.001;
x=[0:1:23];
y=[-61.429,-58.635,-57.02,-54.306,-53.42,-50.796,-49.6,-36.278,35.735,146.684,259.955,332.941,372.657,398.11,387.08,370.301,309.843,242.748,130.381,17.412,-57.716,-80.582,-72.352,-63.972];
plot(x,y,'*-')
>> x0=0:0.001:23;
>> y0=spline(x,y,x0);
>> y1=y0.*(y0> y2=y0.*(y0>0);
>> S1=trapz(y1)*0.001
S1 =
-631.1020
>> S2=trapz(y2)*0.001
S2 =
3.0021e+003

matlab 求曲线与x轴的正负面积之和y=[-61.429,-58.635,-57.02,-54.306,-53.42,-50.796,-49.6,-36.278,35.735,146.684,259.955,332.941,372.657,398.11,387.08,370.301,309.843,242.748,130.381,17.412,-57.716,-80.582,-72.352,-63.972]x=[0:1:23]每个y 如何使用Matlab将离散点转化为曲线,并求其与x轴包围而成的面积? (本大题10分)已知上半平面内一曲线y=y(x) (x≥0)过点(0,1),且曲线 上任一点M(x0,y0)处切线斜率数值上等于此曲线与x轴,y轴,直线x=x0所围成的面积与该点纵坐标之和,求此曲线方程. matlab拟合的曲线如何求积分面积?只知道25个离散点的数据（x,y）不知道函数表达式,用cftool拟合的曲线,type of fit选择的smoothing spline,如下图所示,我现在想求x从[0,24]曲线与x轴包围的面积,请问 matlab怎样求曲线围成的面积 求曲线y=-x^3+x^2+2x与x轴所围成的图形面积. 求曲线y=-x³+x²+2x与x轴所围成图形的面积. 动点P在x轴与直线l:y=3之间的区域(含边界)上运动,且点P到点F(0,1)与直线l的距离之和为4.过点Q(0,-1)作曲线C的切线,求所作的切线与曲线C所围成的区域的面积. matlab 求面积求y = x2和y = x这两个条件曲线在0≤x≤1上所包含的面积 能求曲线与曲线之间的面积吗 具体 根号x+根号y=1的曲线与x轴,y轴未成图形D的面积S,求S. 求曲线y=3-3x^2与x轴所围成的图形的面积? 求曲线y=3-3x^2与x轴所围成的图形的面积? 求由曲线y＝x与曲线y＝x所围成的图形的面积. 求曲线y=4x与曲线y=x³所围成的平面图形的面积 7．(11分)如图所示,设曲线 上的点与x轴上的点顺次构成等腰直角三角形△OB1A1,△A1B2A2,…,直角顶点在曲线 上．试求An的坐标表达式,并说明这些三角形的面积之和是否存在． 求曲线Y=-X3+X2+2X与X轴围成的图形面积 已知F1、F2是双曲线3X^2-2Y^2=6的左右焦点,动点P到F1、F2的距离之和为6,设动点P的轨迹是曲线E1、求曲线E的方程2、设直线J过F1与曲线E相交于AB两点,求（三角形）ABF2面积最大时直线J的方程.