When I import this function, there is a error when I run this codes.

function importfile(fileToRead1)
%IMPORTFILE(FILETOREAD1)
%  Imports data from the specified file
%  FILETOREAD1:  file to read

%  Auto-generated by MATLAB on 04-Nov-2021 14:13:03

% Import the file
newData1 = load('-mat', fileToRead1);

% Create new variables in the base workspace from those fields.
vars = fieldnames(newData1);
for i = 1:length(vars)
    assignin('base', vars{i}, newData1.(vars{i}));
end

importfile('gravity_anomaly_.mat')

<Error>

Not enough input arguments.

Error in importfile (line 9)

newData1 = load('-mat', fileToRead1);

[DGM]

It works fine for me.

whos % nothing in the base workspace
importfile('carbig.mat') % load
whos % now there's a bunch of stuff in the workspace

  Name                Size            Bytes  Class     Attributes

  Acceleration      406x1              3248  double              
  Cylinders         406x1              3248  double              
  Displacement      406x1              3248  double              
  Horsepower        406x1              3248  double              
  MPG               406x1              3248  double              
  Mfg               406x13            10556  char                
  Model             406x36            29232  char                
  Model_Year        406x1              3248  double              
  Origin            406x7              5684  char                
  Weight            406x1              3248  double              
  cyl4              406x5              4060  char                
  org               406x7              5684  char                
  when              406x5              4060  char                

function importfile(fileToRead1)
%IMPORTFILE(FILETOREAD1)
%  Imports data from the specified file
%  FILETOREAD1:  file to read
%  Auto-generated by MATLAB on 04-Nov-2021 14:13:03
% Import the file
newData1 = load('-mat', fileToRead1);
% Create new variables in the base workspace from those fields.
vars = fieldnames(newData1);
for i = 1:length(vars)
    assignin('base', vars{i}, newData1.(vars{i}));
end
end

Answer 1

[Steven Lord]

Is this line:

importfile('gravity_anomaly_.mat')

inside the importfile function or do you run this in the Command Window?

I suspect you called importfile with no input arguments. If that's correct, move that line I quoted above out of the importfile function and use that to call importfile with an input argument.

Answer 2

[Walter Roberson]

https://www.mathworks.com/help/matlab/ref/load.html

load() is not documented as being able to accept the -mat option before the file name, so it is possible that in your version (which you did not mention... hint, hint) that the parsing is deciding that the -mat is the first option and that the filename is missing.

Answer 3

[Image Analyst]

You don't need that function. In fact we usually don't recommend using assignin() anyway. Instead of the importfile() function, which reads the filename into the base workspace, you can simply call load() which will do exactly the same thing:

load('gravity_anomaly_.mat')

Again, there is no need to call that importfile() function from your script at all.