How to split .mat data into different variables?

2021 4 14
1 个回答
回答已采纳
更新时间：2021 4 14
5 次查看（30 天）

0 个投票

I have .mat file in workspace which is 5120x1 dimention. I want to split that into (1024x1), (2048x1), (3072x1), (4096x1) and (5120x1) in 5 different varibales.
Is it possible with mat2cell function?

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

madhan ravi
madhan ravi 2021-4-14
You haven’t told us what classes they are and haven’t shared the file either.

请先登录，再进行评论。

请先登录，再回答此问题。

 采纳的回答

Rik
Rik 2021-4-14
Ran in:

0 个投票

Ran in:
You can't have a file in your workspace, only variables (and objects if you don't count those as variables).
There are some guesses involved in what you want. Below is my best guess.
data=rand(5120,1);%generate some random data
c=num2cell(1024:1024:5120);
for n=1:numel(c)
c{n}=data(1:c{n});
end
c
c = 1×5 cell array
{1024×1 double} {2048×1 double} {3072×1 double} {4096×1 double} {5120×1 double}
You shouldn't want to put it in seperately named variables, as that will prevent you from using indexing to get to these results. However, if you insist, you can use the deal function to split the cell.
[foo,bar,foobar,f00,barr]=deal(c{:});
foo
foo = 1024×1
0.5291 0.7418 0.5861 0.9820 0.9140 0.5865 0.2450 0.8748 0.7799 0.4680

8 个评论
显示 6更早的评论 隐藏 6更早的评论

Faheem Ur Rehman
Faheem Ur Rehman 2021-4-14
if the data is 51200, and i need 1024 chunk of that 51200. So how can i save that 50 chunks of 1024 into 50 variables .?
Rik
Rik 2021-4-14
You can, but you shouldn't. Why do you think you need 50 different variables? Why wouldn't the cell array do the job? I haven't seen a situation yet where this would be required. Maybe yours is the first, but without an explanation of what you want, I'm going to assume you shouldn't be using eval to create variable names.
Faheem Ur Rehman
Faheem Ur Rehman 2021-4-14
Acctully i have dataset of (2x1024x 31200) in which 2 show real and imaginary part and that each signal is 1024 bit long and there is 31200 examples. But i need only fist 50 examples to test the model accuracy.
that why i need 50 variable that i store in my drive and then i give that path to the model.
Rik
Rik 2021-4-14
You don't need 50 variables.
Either you provide the input in a loop to a function, in which case this cell array will work just fine, or your function loads data from a mat file, in which case it will expect a specific variable name, which also doesn't require 50 different variables.
If you want help implementing the input to your model, feel free to comment or ask a new question. As for this specific question; did my answer solve your question? If so, please consider marking it as accepted answer.
Faheem Ur Rehman
Faheem Ur Rehman 2021-4-14
because i want to save that data thats why i need 50 variable. Then i can save that data. Without assigning value from (0:1024) and (1025:2048).... etc how can i save it. For 5 variable its easy but i cant write 50 variable like in
[foo,bar,foobar,f00,barr]=deal(c{:}); function.
madhan ravi
madhan ravi 2021-4-14
Well , that’s why naming variables is discouraged. Why would you do that intentionally??
Rik
Rik 2021-4-14
for n=1:numel(c)
data=c{n};
filename=sprintf('data_part_%02d.mat',n);
save(filename,'data')
end
This will write the 50 mat files you appear to want.
You still haven't explained how the input to your later function works. We might be able to suggest improvements.
Faheem Ur Rehman
Faheem Ur Rehman 2021-4-14
The earlier code you give me is giviing output of (1024,1) 5 times but i need (0:1024),(1025:2048)... like that.

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Workspace Variables and MAT Files 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by