"Invalid use of operator" importing lab data

Question

Adam Eshenaur 2019-2-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/442846-invalid-use-of-operator-importing-lab-data

回答： Satoshi Kobayashi 2019-2-3

在 MATLAB Online 中打开

I was given a file to import lab data, but it is not working properly.

Any ideas on what may be causing my error?

I am a matlab novice, so any input is appreciated.

Error using ME201tension (line 31)

Error: Invalid use of operator.

% Program to Load and Process Tension Test Data
%
%
% 1. Define all data files - follow a particular format of: Material
Materials=str2mat('Steel','Aluminum','Brass');
RunNumber=1; % assumes Run number 1 will be used in all cases or edit
% This can access all data files generated by the LabVIEW code,
% An example FileName is:
% Aluminum1.txt
%
% 2. Choose which file to process - there are many ways to do this, this is one way
MaterialNumberToProcess=1; % this could be a loop index, or edit as 1, 2 or 3
MaterialToProcess=deblank(Materials(MaterialNumberToProcess,:));
%
%
% 3. Load data - make sure you include a space inside the quotes after the load word
% Using : String Construction method
%
% EDIT THIS - Specify the path to a folder containing the data (this is an example)
FilePath=['U:\LAB\']; % end this string with a \
% For MATLAB to load files, the data file must be in a path with no space characters,
% instead the style is to use a capital letter just after where the space would have been,
% for example ‘Tension test' becomes ‘TensionTest'
% You should use this style throughout the laboratory course experiments.
%
FileName=[MaterialToProcess int2str(RunNumber)];
FileExtension='.txt'; % text file extension was used (include a period)
%
%
LoadString=['load' FilePath FileName FileExtension];
eval(LoadString)
% This evaluates the string LoadString as if it was typed onto the
% MATLAB command line. The data is placed into memory under the variable name
% to match the arbitrary value of the FileName string
%