Split vector by value ranges?

11 次查看（过去 30 天）
Don Kelly
Don Kelly 2021-1-26
编辑： Don Kelly 2021-1-28
Given:
w=[2,8,3,30,4,50,100,200,4,80,500]
How can I turn the following into a single line of code?
r=w(w>0 & w<10)
s=w(w>10 & w<100)
t=w(w>100 & w<1000)
I tried variations of:
[r,s,t]=w(w>0 & w<10),w(w>10 & w<100),w(w>100 & w<1000)
  2 个评论
Stephen23
Stephen23 2021-1-26
编辑：Stephen23 2021-1-26
@Don Kelly: I removed all of those ```and ´´´ characters, and formatted your code correctly by simply selecting the text and clicking the CODE button.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

weikang zhao
weikang zhao 2021-1-26
Use anonymous functions, it allows you to implement quite complex functions in one line. MATLAB supports dot indexing into function call results, as in foo(arg).prop. Other forms of indexing into function call results (with parentheses such as foo(arg)(2) or with curly braces such as foo(arg){2}) are not supported. So, I used feval and anonymous functions to complete this function in disguise.
w=[2,8,3,30,4,50,100,200,4,80,500];
[r,s,t]=feval(@(x) x{:},arrayfun(@(a,b) w(w>a&w<b),[0,10,100],[10,100,1000],'UniformOutput',false));
have fun!
  3 个评论
显示 1更早的评论
Don Kelly
Don Kelly 2021-1-26
I guess also is there a less advanced way?
weikang zhao
weikang zhao 2021-1-26
An anonymous function does not need to name the function handle, you can destroy it in place after using it like I did. You can view the output of arrayfun&`feval`, this will help you understand. `arrayfun` can apply function to each element of array, so
arrayfun(@(a,b) w(w>a&w<b),[0,10,100],[10,100,1000],'UniformOutput',false)
will get a cell array and three matrices are stored separately.

请先登录，再进行评论。

更多回答（1 个）

Walter Roberson
Walter Roberson 2021-1-26
[r,s,t] = deal(w(w>0 & w<10),w(w>10 & w<100),w(w>100 & w<1000))
  1 个评论
Don Kelly
Don Kelly 2021-1-28
Thank you Walter,
I accepted weikang zhao's answer since it was functional and first. I wanted to say that I am really grateful for your answer as well.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Cell Arrays 的更多信息

标签

产品


版本

R2018b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by