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
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 fu

Graphics objects: The objects involve graphics primitives like lines and text, and also the axes used to orient the objects. These objects are organized hierarchically, and the

Types of errors: There are some various kinds of errors which can occur in a program, that fall into the categories of run-time errors, syntax errors, and logical errors. T

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

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

Nested for Loops: The action of a loop can be any of the valid statement(s). Whenever the action of a loop is the other loop, this is known as nested loop. As an illustrati

Illustration of tracing a error: The one way of following the flow of function, or tracing it, is to use the echo function. The echo function, that is a toggle, will show each

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

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

Median The median is defined only for a data set which has been sorted first, that means that the values are in order. The median of a sorted set of data values (n) is defined