For example:įprintf('Take %d minute and check out %s ',time, site, title) įor additional information on all the fprintf arguments, see the Mathworks website. The fprintf command is also used as a way to display data to the screen, and will utilize the same ‘%’ placeholders. This allows the file to be written to (not read only) through other programs such as Excel or Notepad++. At the end of this example, we also closed the file using the ‘fclose’ command. The extra trailing zeros are added since we specified that the floating point number have a width of 8, and the precision be 3. In this example two lines will be stored, with the first row displaying Inches 5.000 and the second line Centimeters 12.700. In these examples we have been storing integer values, but strings (%s), characters (%c), floating point values (%f), can all be stored in similar fashion.įprintf(fid,'%s %8.3f ','Inches',A(1)) įprintf(fid,'%s %8.3f ','Centimeters',A(2)) What happens if you have an unknown sized matrix? You do not want to manually type in several ‘%d ’ into the fprintf command, and therefore one workaround is to use the ‘size’ and ‘repmat’ functions. The correct fprintf command will therefore be: In the example above, applying to each element had the net. fprintf uses the formatting string on each element of the variable. Use the fprintf function, which accepts a C printf-style formatting string. But the most important part is the fact that you must use the handle on the fprintf function to update the previous. Note how I need to use 4 backspace characters to delete the previous progress and two percent characters to write the percent symbol at the end of the line. To properly display the matrix, you will need to transpose matrix A. How do I print (output) in Matlab Type the name of a variable without a trailing semi-colon. fprintf (' ') To go to a new line after reaching 100 progress. In order to do so, we might run the following:īut when you open the file ‘example.txt’, oh no! You’ll see that the matrix has been written as ! During the write process, fprintf will read down each column instead of across each row. They will be tab delimited ( ), and after every three integers written, we will begin again on a new line ( ). Provides total control over appearance of output. fprintf Slightly more complicated than disp. Provides limited control over appearance of output. Output to a le requires the fprintf function. To save this data to ‘example.txt’, we will store three integers (%d) across each row. Output to the command window is achieved with either the disp function or the fprintf function. Now let’s try to save some data.Īssume, we have the 2 x 3 array A = There are several other options such as ‘a’ which appends to a file.

(Note: if fid equals -1, there was an error in opening the file). The ‘w’ argument allows us to create and write to the file.

In this case, the file will be located in the current working directory, under the name ‘example.txt’. This can be done using the fopen command: Prior to saving data, you need to initialize a file id. Let’s run through some examples to get you familiar with the concepts. One easy way to do so is via the fprintf command.

Saving data to a text file can be a useful way to access results of your Matlab code at a later time.

Matlab fprintf function