www.gusucode.com > matlab 案例源码 matlab代码程序 > matlab/WriteToTextFilesUsingFprintfExample.m
%% Write to Text Files Using |fprintf| % This example shows how to create text files, including combinations of % numeric and character data and nonrectangular files, using the low-level % |fprintf| function. % % |fprintf| is based on its namesake in the ANSI(R) Standard C Library. % However, MATLAB(R) uses a vectorized version of |fprintf| that writes data % from an array with minimal control loops. %% Open the File % Create a sample matrix |y| with two rows. x = 0:0.1:1; y = [x; exp(x)]; %% % Open a file for writing with |fopen| and obtain a file identifier, |fileID|. By % default, |fopen| opens a file for read-only access, so you must specify the % permission to write or append, such as |'w'| or |'a'|. fileID = fopen('exptable.txt','w'); %% Write to the File % Write a title, followed by a blank line using the |fprintf| function. To % move to a new line in the file, use |'\n'|. fprintf(fileID, 'Exponential Function\n\n'); %% % Note: Some Windows(R) text editors, including Microsoft(R) Notepad, require % a newline character sequence of |'\r\n'| instead of |'\n'|. However, |'\n'| is % sufficient for Microsoft Word or WordPad. %% % Write the values in |y| in column order so that % two values appear in each row of the file. % |fprintf| % converts the numbers or characters in the array inputs to text % according to your specifications. Specify |'%f'| to print floating-point % numbers. fprintf(fileID,'%f %f\n',y); %% % Other common conversion specifiers include |'%d'| for integers or |'%s'| for characters. |fprintf| reapplies the conversion information to cycle through all values % of the input arrays in column order. %% % Close the file using |fclose| when you finish writing. fclose(fileID); %% % View the contents of the file using the |type| function. type exptable.txt %% Additional Formatting Options % Optionally, include additional information in the call to |fprintf| to % describe field width, precision, or the order of the output values. For % example, specify the field width and number of digits to the right of the % decimal point in the exponential table. fileID = fopen('exptable_new.txt', 'w'); fprintf(fileID,'Exponential Function\n\n'); fprintf(fileID,'%6.2f %12.8f\n', y); fclose(fileID); %% % View the contents of the file. type exptable_new.txt