Why is the following code not working to print using fprintf ?

I am trying to print the following into the text file 'leftImageResults'.

Can someone please inform me as to why the code is not printing nor creating the desired text file?

I have used: https://au.mathworks.com/help/matlab/ref/fprintf.html#btf98f7 as a guide but still can't figure out why it is not working.

% Headers to use in text file output
headLeft1 = 'Left IO Values of Interest'
headLeft2 = 'Least Squares Adjustment Results of Interest'
headLeft3 = 'Parameter Corrections Vector'          
headLeft4 = 'Residuals Vector' 
headLeft5 = 'Transformed Points'

% LSA Results
strVal1 = [mat2str(A_left)]      % A matrix Left
strVal2 = [mat2str(del_hatLeft)] % Corrections Vector
strVal3 = [mat2str(w_left)]      % Misclosure Vector
strVal4 = [mat2str(r_hatLeft)]   % Residuals

fid = fopen('LeftImageResults.txt','w')
fprintf(fid,'%1s\r\n %2s\r\n %3s\r\n %4s\r\n ',headLeft1,headLeft2,headLeft3,headLeft4)
fprintf(fid,'%1.6f\r\n %2.6f\r\n %3.6f\r\n %4.6f\r\n', strVal1, strVal2, strVal3, strVal4)
fclose(fid)

Answer 1

[Jay]

I found the problem.

As I am working of a portable HD I would select the drive and select the "Add to Path" then "Selected Folders and Subfolders" option rather than specify the specific file path.

The txt file was created and added to the bottom of the complete folders and files list in the drive (lost amongst the numerous other files).

Thanks for all your help Mischa and Image Analyst

[Image Analyst]

Well we never would have guessed that (since you never mentioned setting the path before).

I still don't know what you did with "Add to Path" then "Selected Folders and Subfolders" option. There is a "Set Path" button on the Home tab of the tool ribbon, and after you click that a "Add with Subfolders" button, but it requires you to specify a specific path, which you say you did not do, and it adds it to the top/beginning of the path, not the bottom. But that's all different than what you did.

But whatever...at least it's working.

Answer 2

[Mischa Kim]

Justin, I assume all variables necessary to create your strVal variables are properly defined, e.g. A_left?

To start with you could comment out the four commands below

 % LSA Results

and see if the txt file is created. This part should work.

[Jay]

Hi Mischa, When I comment out the LSA Results section I get the following error:

_Undefined function or variable 'strVal1'.

Error in SimilarityTransformationProgramV3_6 (line 793) fprintf(fid,'%1.6f\r\n %2.6f\r\n %3.6f\r\n %4.6f\r\n', strVal1, strVal2, strVal3, strVal4)_

The variables are properly defined as in they are the same labels and are matrices / vectors.

[Mischa Kim]

Can you attach the entire code?

What happens if you run:

% Headers to use in text file output
headLeft1 = 'Left IO Values of Interest'
headLeft2 = 'Least Squares Adjustment Results of Interest'
headLeft3 = 'Parameter Corrections Vector'          
headLeft4 = 'Residuals Vector' 
headLeft5 = 'Transformed Points'
% LSA Results
% strVal1 = [mat2str(A_left)]      % A matrix Left
% strVal2 = [mat2str(del_hatLeft)] % Corrections Vector
% strVal3 = [mat2str(w_left)]      % Misclosure Vector
% strVal4 = [mat2str(r_hatLeft)]   % Residuals
fid = fopen('LeftImageResults.txt','w')
fprintf(fid,'%1s\r\n %2s\r\n %3s\r\n %4s\r\n ',headLeft1,headLeft2,headLeft3,headLeft4)
% fprintf(fid,'%1.6f\r\n %2.6f\r\n %3.6f\r\n %4.6f\r\n', strVal1, strVal2, strVal3, strVal4)
fclose(fid)

[Jay]

Running the following code:

% Headers to use in text file output
headLeft1 = 'Left IO Values of Interest'
headLeft2 = 'Least Squares Adjustment Results of Interest'
headLeft3 = 'Parameter Corrections Vector'          
headLeft4 = 'Residuals Vector' 
headLeft5 = 'Transformed Points'

% LSA Results
strVal1 = [mat2str(A_left)]      % A matrix Left
strVal2 = [mat2str(del_hatLeft)] % Corrections Vector
strVal3 = [mat2str(w_left)]      % Misclosure Vector
strVal4 = [mat2str(r_hatLeft)]   % Residuals

fid = fopen('LeftImageResults.txt','wt')
fprintf(fid,'%s %s %s %s\n ',headLeft1,headLeft2,headLeft3,headLeft4)
fprintf(fid,'%.6f %.6f %.6f %.6f\n', strVal1, strVal2, strVal3, strVal4)
fclose(fid)

The command window outputs:

headLeft1 =

Left IO Values of Interest

headLeft2 =

Least Squares Adjustment Results of Interest

headLeft3 =

Parameter Corrections Vector

headLeft4 =

Residuals Vector

headLeft5 =

Transformed Points

strVal1 =

[3482.055 -280.3875 1 0;-280.3875 -3482.055 0 1;3468.405 -3497.265 1 0;-3497.265 -3468.405 0 1;254.145 -3481.535 1 0;-3481.535 -254.145 0 1;268.4725 -267.7825 1 0;-267.7825 -268.4725 0 1;1867.32 -1881.635 1 0;-1881.635 -1867.32 0 1]

strVal2 =

[0.0140001478661937;-6.13134643096367e-05;-26.3329640591793;26.069033817171]

strVal3 =

[-22.431;-22.341;-22.448;22.668;22.572;22.659;22.564;-22.341;0.064;0.159]

strVal4 =

[0.00251234801378786;0.0160642123053307;-0.00835176657502856;-0.0125333839139401;0.0105684922396989;0.00161152622938943;0.00610931158383465;-0.00449979976112047;-0.0108383852623071;-0.000642554859647843]

fid =

     3

ans =

   119

ans =

        5841

ans =

     0

Answer 3

[Image Analyst]

I don't have your data so I can't really reproduce. But try 'wt' instead of 'w' when you call fopen. And try using various combinations of \n, \n\r, and \r\n, until you get what you want.

And don't use %1s etc. Just use %s alone.

[Jay]

Just a thought, do I need to create the file before trying to open it?

I was of the understanding that the fopen command creates the txt file if it does not exist ('w' or 'wt' command).

If that's wrong then can you please tell me the necessary command to initialise a blank txt file so I can populate it?

I also noticed in the example that the \n, \n\r is only stipulated in the last format specifier as compared to each format specifier.

Changing this still does not resolve the problem.

Thanks in advance.

[Image Analyst]

Calling fopen() does create the file first, then opens it for writing. Then fprintf() writes into it.

[Jay]

Thanks Image, that's what I thought.