Illustration of reading from files, MATLAB in Statistics

Illustration of reading from files:

For illustration, suppose that there is a data file 'subjexp.dat' that has on each line a number followed by thecharacter code. The type function can be used to show the contents of this file (as the file does not have the default extension .m, the extension on the filename should be involved).

>> type subjexp.dat

5.3 a

2.2 b

3.3 a

4.4 a

1.1 b


The load function would not be capable to read this into the matrix as it holds both numbers and text. Rather than, the fgetl function can be used to read each line as a string and then the string functions are used to break up the numbers and characters. For illustration, the below just reads each line and prints the number with 2 decimal positions and then the rest of the string:

1648_Illustration of reading from files.png

2340_Illustration of reading from files1.png

Here is an illustration of executing this script:

>> fileex

5.30 a

2.20 b

3.30 a

4.40 a

1.10 b

File close successful

In this illustration, in the loop each and every time the fgetl function reads one line into the string variable. The string function strtok is then used to store the number and character in individual variables, both of which are the string variables. The function str2num should then be used to convert the number stored in the string variable into a double variable so that computations could be performed on it.

Rather than of using the fgetl function to read one line, a file has been once opened the fscanf function could be used to read in from this file directly into a matrix.

Though, the matrix should be manipulated somewhat to get it back into the unique form from the file. The format of using the function is as shown below:

mat = fscanf(fid, 'format', [dimensions])

Posted Date: 10/20/2012 6:24:04 AM | Location : United States

Related Discussions:- Illustration of reading from files, Assignment Help, Ask Question on Illustration of reading from files, Get Answer, Expert's Help, Illustration of reading from files Discussions

Write discussion on Illustration of reading from files
Your posts are moderated
Related Questions
Example of Mode When no value appears more often than any other, the smallest value in the vector will be the mode of the vector. >> shortx = [2 5 1 4]; >> mode(shortx

Functions which return Values versus printing: Also, the function which computes and returns values (throughout the output arguments) does not generally print them; that is le

Vectorizing: In most of the cases in MATLAB, loops are not essential. As MATLAB is written specifically to work with the vectors and matrices, most operations can be completed

Polynomials: Simple curves are polynomials of various degrees, or orders. The degree is the integer of the highest exponent in the expression. The illustrations are as follows

Illustration of Nested loops: Running the script shows the output: >> printstars ***** ***** ***** The variable rows identifies the number of rows to print, and

Illustration of Mode When there is more than one value with similar (highest) frequency, then the smaller value is mode. In the case below, as 3 and 8 appear twice in the vecto

Sequential Search: A sequential search is completed by looping through the vector element-by-element starting from the beginning, looking for the key. Usually the index of the

Properties of the text box - graphics objects: By using get will show properties of the text box, the illustration is as shown below: >> get(thand)   BackgroundColor

Determine sequence weights for the sequences ACTA, ACTT, CGTT, and AGAT in problem 1 by using Thompson, Higgins, and Gibson method a) compute pairwise distances between sequences

Sorting Strings: For the matrix of strings, the sort function works exactly as formerly for numbers. For illustration, >> words = char('Hi', 'Hello', 'Howdy', 'Goodbye', '