Can I load a file without single quotes?

Question

Alireza Babaei 2022-9-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1796830-can-i-load-a-file-without-single-quotes

评论： Walter Roberson 2022-9-7

采纳的回答： Walter Roberson

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Dear all,

I am trying to load some files but I get the following error:

Not enough input arguments.

the code I use looks like this:

load(settings_file,'A', 'B');

What are the reasons and potential ways fo fix it?

Another question i swhy the code does not uses single quote sign for the first element (settings_file)? - I am using sb elses files.

another point comming to my mind is: I get the error as I think I cannot find the directory (location where the data is stored).

Any hints?

Thanks!

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Cris LaPierre 2022-9-6

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Can you share the output you get when running the following code in the command window?

which load

Alireza Babaei 2022-9-7

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sure, here it is:

 which load
built-in (C:\Program Files\MATLAB\R2020b\toolbox\matlab\general\load)

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Answer 1

Walter Roberson 2022-9-6

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What you describe suggests to me that you are using someone else's code that has been written in the form of a function. The person who wrote the code expected that the code would be invoked using the function name and the name of a .mat file to load, but you are just running the function (probably by pressing the green Run button.)

You need to pass in the name of a .mat file. For example,

AnalyzeExperiment( 'data20220902.mat')

if the name of the .m file were AnalyzeExperiment and the name of the mat file were data20220902.mat

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Alireza Babaei 2022-9-7

Thanks!

I understand, I do not have the 'A' and 'B' files, so first I need to find them and then run it.

Walter Roberson 2022-9-7

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NO! 'A' and 'B' are not files! See for example,

settings_file = 'SomeFileName.mat';
A = 123;
B = 456;
C = 789;
save(settings_file, 'A', 'B', 'C');
ls('-l', settings_file)
-rw-r--r-- 1 mluser worker 265 Sep  7 19:40 SomeFileName.mat
whos('-file', settings_file)
  Name      Size            Bytes  Class     Attributes

  A         1x1                 8  double              
  B         1x1                 8  double              
  C         1x1                 8  double              
clearvars -except settings_file
whos
  Name               Size            Bytes  Class    Attributes

  settings_file      1x16               32  char               
load(settings_file, 'A', 'B')
whos
  Name               Size            Bytes  Class     Attributes

  A                  1x1                 8  double              
  B                  1x1                 8  double              
  settings_file      1x16               32  char                
A
A = 123
B
B = 456

Variables A, B, C are saved in SomeFileName.mat -- a file name that is stored in the variable named settings_file . You can see that the saved file exists and has 265 bytes on disk; you can see that the disk file is named SomeFileName.mat (same as what was stored in the variable.) The file name on disk is not settings_file.mat . You can see that the file has variables named A B C stored inside it.

You can see that I then clear all of the variables except the file name, so A, B, and C are no longer in memory.

You can see that I then load variables A and B from the file; you can see that when I did this, only the named variables A and B got loaded, not any other variables such as C .

A and B are not file names in that syntax: they are variable names. And at that location in the person's code, settings_file is a variable whose name contains the name of the file to load from.

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