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Advanced File Input and Output:
In that section, we saw how to read the values entered by user using the input as well as the output functions disp and fprintf, that shows information in windows on the screen. For file input and output (file I/O), we used the load and save the functions, that can read from a data file into the matrix, and write from a matrix to a data file. We also saw that there are three various operations which can be performed on files: reading from files, writing to files (implying writing to the starting of a file), and appending to a file (that is writing to the end of the file).
There are many different file types that use dissimilar filename extensions. Faraway, using load and save, we have worked with files in the ASCII format that usually use either the extension .dat or .txt. The load command works only if there are similar number of values in each line and the values are of similar type, so that the data can be stored in a matrix; the save command writes only from the matrix to a file. When the data to be written or file is to be read in a different format, then the lower level file I/O functions should be used.
The MATLAB software has functions which can read and write data from variousfile types like spreadsheets; usually Excel spreadsheets have the filename extension .xls. It has its own binary file type also that uses the extension .mat.
These are generally known as MAT-files, and can be used to store the variables which have been generated in the MATLAB.
Combining Nested FOR Loops and the IF Statements: The statements inside a nested loop can be any of the valid statement, involving any selection statement. For e.g., there can
Reading from Files: There are many lower level functions which read from files. The function fscanf reads the formatted data into a matrix, by using conversion formats like %s
Opening and Closing a File: The Files are opened with the fopen function. By the default, fopen function opens a file for reading. If the other mode is preferred, a permission
Illustration of Input in a for loop: In this illustration, the loop variable iv iterates through the values 1 through 3, therefore the action is repeated three times. The acti
Example of Functions which return values: Calling this function prints the circumference, since there is no way to store the value, hence, it can be used in following computat
Function polyval - interpolation: The function polyval can then be used to compute the polynomial at particular values. For illustration, we could compute at every value in th
Illustration of Indexing: Though, rather than of creating the index vector manually as shown here, the process to initialize the index vector is use to a sort function. The al
Example of Median For the vector [1 4 5 9 12 33], the median is the average of the 5 & 9 in the middle: >> median([1 4 5 9 12 33]) ans = 7
Lower Level File I/O Functions: Whenever reading from data file, as long as the data in the file is "regular" the load function works-in another words, the similar type of dat
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