How can I change the arrangement of values and plot them?

Hello, I am working on a project using Matlab's GUI. However, there was a problem. I'd like to retrieve the value of the text file as shown in the first picture. However, the results are printed like the second picture. I want the same result as the third picture. What should I do? With str2double, the NaN value is output. And my final goal is to plot these values. help :(

used code

str = extractFileText('uncoded_BER.txt');
assignin('base', 'str', str);

[KSSV]

Can't you use textscan, importdata, load funcctions?

You can convert the given str variable to double using str2double and then transpose.

Am I missing something?

[건희 이]

The values in the text file change fluidly in the GUI. So I don't think I can use a function like textscan. Or maybe I'm misunderstanding textscan function. because I don't know textscan, importdata function very well.

[건희 이]

Because the values in the unencoded_BER.txt file change according to the variables I set in the previously

[dpb]

data=readmatrix('uncoded_BER.txt');

will return data data as double that you'll need to plot. What the point of assignin is here is unknown; probably should be avoided.

[Hiro Yoshino]

If you have multiple data

data=readtable("uncoded_BER.txt")
data.var1

would be userful as you can access multiple columns easily.

[건희 이]

thank you!! complet!!

Answer 1

[Yash]

Hello,

I understand that you are interested in importing the the data from a text file as a matrix (or array) and plotting it. Currently, you are using the "extractFileText" function, which reads the entire text from the file and stores it as a string. In your case, it is '-1.5093\n3.4562' where '\n' represents the new line character. This can't be converted to an array using the "str2double" function as it is not in a proper numeric form. Hence you are getting NaN.

There are several other functions you can utilize to import data as a matrix (or array). A few of them are listed below:

1. "importdata" - This can be used to load data from a file as a matrix. The documentation is available at the following link: https://www.mathworks.com/help/matlab/ref/importdata.html

A = importdata('uncoded_BER.txt')

2. "load" - This function is used to load variables from a file into the workspace. Refer to the following link for the documentation: https://www.mathworks.com/help/matlab/ref/load.html

A = load('uncoded_BER.txt')

3. "readmatrix" - This function is specifically designed to read a matrix from a file. You can refer the documentation here: https://www.mathworks.com/help/matlab/ref/readmatrix.html

A = readmatrix('uncoded_BER.txt')

4. "readtable" - This function creates a MATLAB table from a file. This would be beneficial if you have multiple data labellled columnwise. The documentation is available at the following link: https://www.mathworks.com/help/matlab/ref/readtable.html

TBL = readtable('uncoded_BER.txt')
A = TBL.Var1

You can use "textscan" as well, refer to the below MATLAB Answer for an example:

https://www.mathworks.com/matlabcentral/answers/512126-how-can-i-read-array-from-a-text-file

Once you have successfully imported the data as a matrix or array, you can use the "plot" function to visualize it. Refer to the documentation of the plot function at the following link: https://www.mathworks.com/help/matlab/ref/plot.html

Hope this helps!