Why doesn't my function for writing a file work?

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Allen Hammack 2021-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/1564761-why-doesn-t-my-function-for-writing-a-file-work

评论： Allen Hammack 2021-10-15

I have a section of code that I'm trying to convert to a function. This code works without being used as a function, so the problem is seemingly with how I'm defining the function. MHere is my function:

function write_fill_empty_data_model_temp(input_general,...
    data_proc_fill_empty)
    output_file_fill_empty_data_model = fopen(strcat(pwd,'\',...
        input_general{1}.raw_data_daily_directory,'\',...
        input_general{1}.raw_data_test_directory,'\',...
        input_general{1}.fill_empty_file_name,...
        '_fill_empty_data_model.txt'),'w');
    fprintf(output_file_fill_empty_data_model,'%s\t%s\n',...
        'Time - Model (s)',...
        'Valve 1 Position (%)');
    fprintf(output_file_fill_empty_data_model,'%.3f\t%.3f\n',...
        [data_proc_fill_empty{1}.time_model_no_shift,...
        data_proc_fill_empty{1}.valve_1_opening_percent]');
    fclose(output_file_fill_empty_data_model);
end

My inputs are two structures. As best as I can tell, the only inputs to this function are the two structures. When I call this function, I get this error:

Not enough input arguments.

Error in write_fill_empty_data_model (line 3)

output_file_fill_empty_data_model =

fopen(strcat(pwd,'\',input_general{1}.raw_data_daily_directory,'\',input_general{1}.raw_data_test_directory,'\',input_general{1}.fill_empty_file_name,'_fill_empty_data_model.txt'),'w');

I have struggled to figure out the problem. Can someone please help?

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Answer 1

Jan 2021-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/1564761-why-doesn-t-my-function-for-writing-a-file-work#answer_809541

编辑：Jan 2021-10-15

"Not enough input arguments" might mean, that you call this function without inputs. Therefore the most important part of the code is missing: how do you call this function?

Maybe you press the green triangle in the editor? This would call trhe function without inputs.

Remarks:

Try to find simpler names for functions and variables. "write_fill_empty_data_model_temp", "input_general" and "data_proc_fill_empty" look really confusing. Calling a file ID "output_file_fill_empty_data_model" is very strange. The standard "fid" is a nice convention.

fullfile() is smarter than strcat() to concatenate path names.