请教如何用MATLAB去fit一个多项式？ - 未名空间MITBBS历史存档

国际科技财经博客移民网络热点娱乐民生时事公众号

Redian新闻

>未名空间

>Computation - 科学计算

请教如何用MATLAB去fit一个多项式？

请教如何用MATLAB去fit一个多项式？# Computation - 科学计算

b*z2008-12-12 08:12

1 楼

I'm working for a leading software company based in Seattle WA. My group has
many openings for Software Design Engineer in Test (SDET). As SDET, you
will be responsible for designing and implementing test automations to test
the production code and performing various tests required to validate the
code before shipping with highest quality in mind.
Here are a few qualifications of the candidates that we're looking for:
1. Strong Computer Science education background (doesn't have to be with CS
de

w*r2008-12-12 08:12

2 楼

我有一组数据
x y
1 8
2 12
3 18
4 22
5 26
想 fit 到一个多项式Y＝A X ＋ B X（root）从而得到A和B并作图。
第一次用MATLAB，不知该如何入手。请各位高手指点！

y*y2008-12-12 08:12

3 楼

do you mean Y=A*X+B*sqrt(X)?

【在 w********r 的大作中提到】

: 我有一组数据
: x y
: 1 8
: 2 12
: 3 18
: 4 22
: 5 26
: 想 fit 到一个多项式Y＝A X ＋ B X（root）从而得到A和B并作图。
: 第一次用MATLAB，不知该如何入手。请各位高手指点！

w*r2008-12-12 08:12

4 楼

YES

【在 y**y 的大作中提到】

: do you mean Y=A*X+B*sqrt(X)?

l*i2008-12-12 08:12

5 楼

lsqcurvefit

【在 w********r 的大作中提到】

w*r2008-12-12 08:12

6 楼

能否请告知具体的command lines?
非常感谢！！！！！！！！！！

【在 l*****i 的大作中提到】

: lsqcurvefit

l*i2008-12-12 08:12

7 楼

lsqcurvefit - Solve nonlinear curve-fitting (data-fitting) problems in least
-squares sense
Equation
Find coefficients x that best fit the equation
given input data xdata, and the observed output ydata, where xdata and ydata
are matrices or vectors of length m, and F (x, xdata) is a matrix-valued or
vector-valued function.
The lsqcurvefit function uses the same algorithm as lsqnonlin, and provides
an interface designed specifically for data-fitting problems.
Syntax
x = lsqcurvefit(fun,x0,xdata,y

【在 w********r 的大作中提到】

:
: 能否请告知具体的command lines?
: 非常感谢！！！！！！！！！！