大师作文网用matlab画分段曲线
来源：学生作业帮 编辑：大师作文网作业帮 分类：综合作业 时间：2024/11/17 04:08:48
用matlab画分段曲线
y=0.3954x^3-0.1435x^4+0.0149x^5 x=0~7 当x=3.5时tga=1.1106
y=0.2961x^3-0.1106x^4+0.0117x^5 x=7~14 当x=10.5时tga=0.70021
y=0.06028x^3-0.00897x^4+0.000395x^5 x=14~30 当x=22时tga=1.1918
因为每一小段关于小段中点对称,所以tga表示每一中点的斜率
完全不怎么懂,拜托给完整的代码,
y=0.3954x^3-0.1435x^4+0.0149x^5 x=0~7 当x=3.5时tga=1.1106
y=0.2961x^3-0.1106x^4+0.0117x^5 x=7~14 当x=10.5时tga=0.70021
y=0.06028x^3-0.00897x^4+0.000395x^5 x=14~30 当x=22时tga=1.1918
因为每一小段关于小段中点对称,所以tga表示每一中点的斜率
完全不怎么懂,拜托给完整的代码,
x1=0:0.1:7;
x2=7:0.1:14;
x3=14:0.1:30;
y1=0.3954.*x1.^3-0.1435.*x1.^4+0.0149.*x1.^5;
y2=0.2961.*x2.^3-0.1106.*x2.^4+0.0117.*x2.^5;
y3=0.06028.*x3.^3-0.00897.*x3.^4+0.000395.*x3.^5;
plot(x1,y1)
hold on
plot(x2,y2)
hold on
plot(x3,y3)
x2=7:0.1:14;
x3=14:0.1:30;
y1=0.3954.*x1.^3-0.1435.*x1.^4+0.0149.*x1.^5;
y2=0.2961.*x2.^3-0.1106.*x2.^4+0.0117.*x2.^5;
y3=0.06028.*x3.^3-0.00897.*x3.^4+0.000395.*x3.^5;
plot(x1,y1)
hold on
plot(x2,y2)
hold on
plot(x3,y3)