why readtable create field "D" in the struct "D1"

function D1=TEST()
D=readtable('test.txt','delimiter',',');
save canc.tset D
D1=load('canc.tset',"-mat")
end

i access it using

D1.D...

it's possibile to avoid "D" field?

[Stephen23]

"why readtable create field "D" in the struct "D1""

It doesn't. READTABLE has nothing to do with the scalar structure returned by LOAD.

Answer 1

[Stephen23]

If there is only one variable in the MAT file (regardless of its extension) and you do not know/care what its name is:

C = struct2cell(load(..));
assert(isscalar(C),'Only one array can be LOADed')
T = C{1}

If the variable name is known in advance, e.g. "D"

S = load(..)
T = S.D

[Luca Re]

Honestly, I didn't quite understand what you wrote above :D

but if you tell me to do

S = load(..)

T =S.D

ok I will Thank you!

[Luca Re]

I tried to save the new table but I find confusing indications in the community and in matlab Could you tell me how to do it? Thank you

[Stephen23]

writetable(T,'mytable.csv')

https://www.mathworks.com/help/matlab/standard-file-formats.html

[Luca Re]

I summarize: I have this table in .mat format

I call it with the command:

[file2,path] = uigetfile({'*.ttslist2'}, 'Select a file');

and i import it using :

T1=importdata(strcat(path,file2));

now T1 is a cell format

In app designer i call this function and

app.UITable.Data=(T1);

• now i've a table
• later I change some table values

Now that I have the new table I want to save it in the original .mat format so I can't use saving in .txt)

[Stephen23]

"Now that I have the new table I want to save it in the original .mat format so I can't use saving in .txt)"

Then select an appropriate function for that file format (read the link that I gave you).

Avoid IMPORTDATA.

[Luca Re]

Ok i used matfile to do it.

but now i want to save new table

i used cell2table and writetable but i get this file:

but i want this type :

[Stephen23]

They look the same to me: both look like CSV files (interpreted by some application which you do not specify). But instead of comparing screenshots, you need to compare the actual text data (which is what CSV files are).

If you want more help, upload the actual CSV files and original MAT file by clicking the paperclip button.

[Luca Re]

the first file (Test2.mat) is original named : TEST.ttslist2 but i change extension in .mat otherwise it couldn't sending it

the second file is created by me by coding:

[file2,path] = uigetfile({'*.ttslist2'}, 'Select a file');
if file2  
    %T1=importdata(strcat(path,file2));
    vv=matfile(strcat(path,file2));
    T1=vv.StratList;
    T = cell2table(T1 )
    writetable(T,"prova,txt");

[Stephen23]

"Now that I have the new table I want to save it in the original .mat format "

Then you should be using SAVE, not WRITETABLE for exporting the data.

Avoid IMPORTDATA, use LOAD instead.

[Luca Re]

i try it but i get error

save('prova.txt',T)

Error using save

Argument must be a text scalar.

(my data is number..string.. )

[Stephen23]

save('prova.txt','T')

SAVE is an exception: it requires the name/s of the variable/s that you want to save, not the variables themselves. That is explained and shown in the SAVE documentation. You should look at the documentation of every function that you use.

[Luca Re]

thank you.. I appreciate the effort you took in answering me