how to save workspace variables with the same name they have in work space

i have lots of variables in the workspace and want to save those with the prefix "PSD", also I want them to have the same name they have now or even better without the "PSD" prefix.

i tried to use:

vars = work PSD*

Answer 1

[mark li]

Hello! There is a simple demo.

%%
%test data
clear;
PSD_a = 1;
PSD_b = 2;
PSD_c =2;
a = 1;

%%
str_set = [];
Save_name = '''a.mat'''; %the save file name
Var_name = who('PSD*');
for index = 1 : length(Var_name)
    str = Var_name{index};
    str_new = str(5:end); %the Value 5 may be changed properly
    eval([str_new '=' str ';'])
    str_set = [ str_set ','  '''' str_new ''''];
end
eval([ 'save(' Save_name  str_set ')'])

%%
%clear data
clear_var = ['clear(''' str_set(3:end-1) ''')' ];
eval(clear_var)

Answer 2

[Stephen23]

A much simpler approach ist use SAVE's regular expression syntax:

save('mydata.mat', '-regexp','^PSD')

See the examples here: https://www.mathworks.com/help/matlab/ref/save.html#btox10b-1-variables

There is no point in making your code more complex than that.

Renaming would be best done by LOADing and changing the fieldnames, for example:

S = load('mydata.mat')

and then use dynamic fieldnames and RMFIELD.

See: https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html

Note that filtering variables by their names implies that you have forced meta-data into the variable names, which is generally very poor data design which will make acessing and processing your data slow, complex, and inefficient.

[Stephen23]

Simple demo:

PSD1 = 11;
PSD2 = 22;
notPSD = 33;
save('mydata.mat', '-regexp','^PSD')
whos -file mydata

  Name      Size            Bytes  Class     Attributes

  PSD1      1x1                 8  double              
  PSD2      1x1                 8  double