Convert a string into a function of x

Question

Nikolas Spiliopoulos 2018-11-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/431172-convert-a-string-into-a-function-of-x

编辑： KRISHNA MAHTO 2023-1-12

采纳的回答： Stephen23

在 MATLAB Online 中打开

Hi all,

I have created a string like this:

Sstr = join(compose('(x(%d:%d)-x(%d:%d))))', A), ' + ')

so I get a result:

Sstr='(x(2:180)-x(1:179)+(x(182:360)-x(181:359))'

Is it possible to convert the string into a function of x like this??:

f=@(x) (x(2:180)-x(1:179)+(x(182:360)-x(181:359))

thanks

Nikolas

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Nikolas Spiliopoulos 2018-11-21

在 MATLAB Online 中打开

Here is the code

A=[2 180 1 179 182 360 181 359];
str = join(compose('(x(%d:%d)-x(%d:%d))', A), ' + ')

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Stephen23 2018-11-21

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/431172-convert-a-string-into-a-function-of-x#answer_348194

编辑：Stephen23 2018-11-21

You can use str2func:

fun = str2func(['@(x)',Sstr]);

and then call it just like any other function.

4 个评论
显示 2更早的评论隐藏 2更早的评论

Nikolas Spiliopoulos 2018-11-21

在 MATLAB Online 中打开

Well I solved my problem by converting the cell to a character like this:

g = cell2mat(Sstr)
 f = str2func(['@(x)' g])

thanks for the comments !

Stephen23 2018-11-21

@Nikolas Spiliopoulos: you should check the contents of g to make sure that they make sense.

Don't forget to accept my answer if it helped you!

请先登录，再进行评论。

Answer 2

KRISHNA MAHTO 2023-1-12

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/431172-convert-a-string-into-a-function-of-x#answer_1146870

编辑：KRISHNA MAHTO 2023-1-12

在 MATLAB Online 中打开

i have taken string as an input form the user ,, and want data to be converted into funtion of x and y , by the program itself ,,,for easy usage ,

%code to take input form the user - 
prompt = "input U:-"
prompt = "input U:-"
u = input(prompt,"s")
Unable to run the 'fevalJSON' function because it calls the 'input' function, which is not supported for this product offering.
prompt = "input V:-"
v = input(prompt ,"s")