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
function sortrows - sorting strings: The function sortrows sorts each and every row as a block, or group, and it also will work on numbers. Here in this illustration the rows

Index vector: The index vector is then used as the indices for original vector. To get grades vector in ascending order, the indices used would be grades (2), grades (5), and

Illustration of Indexing into vectors of structures: For illustration, the function to print the information from packages has been modified therefore in addition to the vecto

Illustrations of Sequential search: The two illustrations of calling such function is as shown below: >> values = [85 70 100 95 80 91]; >> key = 95; >> seqsearch

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

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

bjjh

Core Objects: The Core Objects in MATLAB are the very fundamental graphics primitives. The description can be found under the MATLAB Help: Under the Contents tab, click the Ha

#qYou will need to examine two of the nine sections of data: one section of qualitative data (choose either Gender or Position) one section of quantitative data (choose either Intr

Illustration of Median When the vector is not in sorted order to start with, the median function will still return the right answer (it will sort the vector automatically). For