Variable packages, MATLAB in Statistics

Variable packages:

Variable packages are now the vector of structures, hence each and every element in the vector is a structure. To show one element in the vector, an index into the vector would be identified. For illustration, to refer to the second element:

>> packages(2)

ans =

item_no: 456

   c  ost: 5.9900

   price: 49.9900

   code: 'l'

 

To refer to the field, it is essential to refer to the specific structure, and then the field within it. This means that using an index into the vector to refer to the structure, and then the dot operator to refer the field. For illustration:

>> packages(1).code

ans =

g

 

Hence, there are necessarily three levels to this data structure. The variable packages are at highest level that is a vector of structures. Each of its elements is a separate structure. The fields within these individual structures are at lowest level. The loop below displays each element in the packages vector.

 

>> for i = 1:length(packages)

disp(packages(i))

end

   item_no: 123

cost: 19.9900

price: 39.9500

code: 'g'

   item_no: 456

cost: 5.9900

price: 49.9900

code: 'l'

   item_no: 587

cost: 11.1100

price: 33.3300

code: 'w'

 

To refer to a specific field for all structures, in most of the programming languages it would be essential to loop through all the elements in vector and use the dot operator to refer to the field for each element. Though, this is not the case of MATLAB.

Posted Date: 10/20/2012 6:06:17 AM | Location : United States







Related Discussions:- Variable packages, Assignment Help, Ask Question on Variable packages, Get Answer, Expert's Help, Variable packages Discussions

Write discussion on Variable packages
Your posts are moderated
Related Questions
Functions which complete a task without returning Values: Most of the functions do not compute values, but instead of accomplish a task like printing formatted output. As thes

Advanced File Input and output: Where 'format' involves the conversion characters much like those used in the fprintf function. For illustration, to read the file 'subjexp.dat

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

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

Illustration of Binary search: An illustration to search for the key of 91 in the vector is as shown below: The table below shows what will happen in each iteration of

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

Input in a While Loop: The script below repeats the procedure of prompting a user, the reading in a positive number, and echo-printing it, as long as the user properly enters

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

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

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