求教matlab编程正余弦函数插值画图给出一组峰值,求教如何编程画出正余弦图形峰值:(0.69,-0.75,0.74,-0.76,0.80,-0.77,0.75,-0.71,0.75,-0.77,0.74,-0.73,0.70,-0.76,0.83,-0.77,0.75,-0.76,0.80)可能没说明白,再补充
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![求教matlab编程正余弦函数插值画图给出一组峰值,求教如何编程画出正余弦图形峰值:(0.69,-0.75,0.74,-0.76,0.80,-0.77,0.75,-0.71,0.75,-0.77,0.74,-0.73,0.70,-0.76,0.83,-0.77,0.75,-0.76,0.80)可能没说明白,再补充](/uploads/image/z/1074950-62-0.jpg?t=%E6%B1%82%E6%95%99matlab%E7%BC%96%E7%A8%8B%E6%AD%A3%E4%BD%99%E5%BC%A6%E5%87%BD%E6%95%B0%E6%8F%92%E5%80%BC%E7%94%BB%E5%9B%BE%E7%BB%99%E5%87%BA%E4%B8%80%E7%BB%84%E5%B3%B0%E5%80%BC%2C%E6%B1%82%E6%95%99%E5%A6%82%E4%BD%95%E7%BC%96%E7%A8%8B%E7%94%BB%E5%87%BA%E6%AD%A3%E4%BD%99%E5%BC%A6%E5%9B%BE%E5%BD%A2%E5%B3%B0%E5%80%BC%EF%BC%9A%EF%BC%880.69%2C-0.75%2C0.74%2C-0.76%2C0.80%2C-0.77%2C0.75%2C-0.71%2C0.75%2C-0.77%2C0.74%2C-0.73%2C0.70%2C-0.76%2C0.83%2C-0.77%2C0.75%2C-0.76%2C0.80%EF%BC%89%E5%8F%AF%E8%83%BD%E6%B2%A1%E8%AF%B4%E6%98%8E%E7%99%BD%2C%E5%86%8D%E8%A1%A5%E5%85%85)
求教matlab编程正余弦函数插值画图给出一组峰值,求教如何编程画出正余弦图形峰值:(0.69,-0.75,0.74,-0.76,0.80,-0.77,0.75,-0.71,0.75,-0.77,0.74,-0.73,0.70,-0.76,0.83,-0.77,0.75,-0.76,0.80)可能没说明白,再补充
求教matlab编程正余弦函数插值画图
给出一组峰值,求教如何编程画出正余弦图形
峰值:(0.69,-0.75,0.74,-0.76,0.80,-0.77,0.75,-0.71,0.75,-0.77,0.74,-0.73,0.70,-0.76,0.83,-0.77,0.75,-0.76,0.80)
可能没说明白,再补充一下,应该是周期相同,都为2,然后给出这些峰值,最后拟合出正弦曲线图
求教matlab编程正余弦函数插值画图给出一组峰值,求教如何编程画出正余弦图形峰值:(0.69,-0.75,0.74,-0.76,0.80,-0.77,0.75,-0.71,0.75,-0.77,0.74,-0.73,0.70,-0.76,0.83,-0.77,0.75,-0.76,0.80)可能没说明白,再补充
您这个有问题.
因为正弦函数有三个要素:
峰值,频率,初相
当然还有一个垂向移位.
也就是说:
y=y0+a*sin(w*t+f0)
%%%%%代码
b=[0.69,-0.75,0.74,-0.76,0.80,-0.77,0.75,-0.71,0.75,-0.77,0.74,-0.73,0.70,-0.76,0.83,-0.77,0.75,-0.76,0.80]';
A=sign(b);
a=x\b
思路:你的变量只有一个a
也就是说
1*a=0.69
-1*a=-0.75
1*a=0.74
…………
1*a=0.80
这样的话,就有关于a的一元一次方程组(方程有19个,变量只有一个,是超定方程),可以用最小二乘法求解.
只要将上面方程组写成矩阵A*x=b的形式,再用x=A\b
对于超定方程组,MATLAB会自动用最小二乘法求解