turn matrix into function ?

Question

best16 programmer 2017-3-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/332191-turn-matrix-into-function

回答： John BG 2017-3-27

采纳的回答： Guillaume

i have two colomns a and b, i want to turn them into a function such as b=f(a),is that possible thank you

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Guillaume 2017-3-27

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/332191-turn-matrix-into-function#answer_260581

在 MATLAB Online 中打开

There is an infinite number of functions that would fit the brief. Perhaps you're looking for a polynomial fit, a spline fit, or something else. It's hard to know with so little information.

f = @(x) b(a == x);

would be a function that fits the brief (and errors for any input that is not in a). I doubt it is what you want.

2 个评论
显示无隐藏无

best16 programmer 2017-3-27

what i want is te determine the point of intersection between a curve and X axis.

Walter Roberson 2017-3-27

What relationship does that have to a and b ?

For example do a and b together create a piecewise cubic spline?

请先登录，再进行评论。

Answer 2

John BG 2017-3-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/332191-turn-matrix-into-function#answer_260591

Hi Best Programmer

the problem you want to solve, the capture of intersections between curves that DO NOT have defined the exact points of interesection is already solved in the MATLAB exchange.

I have used Mr Schwarz's function intersections.m repeatedly and it always hits the points the right points:

https://uk.mathworks.com/matlabcentral/fileexchange/11837-fast-and-robust-curve-intersections?s_tid=srchtitle

at least 2 points per curve. Try it, it works.

if you find these lines useful would you please mark my answer as Accepted Answer?

To any other reader, if you find this answer of any help please click on the thumbs-up vote link,

thanks in advance for time and attention

John BG

<mailto:jgb2012@sky.com jgb2012@sky.com>