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

Ask an Expert

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

Write your message here..

Related Questions

Function stubs, Function Stubs: The other common debugging method, whi... Function Stubs: The other common debugging method, which is used when there is a script main program which calls many functions, is to use the function stubs. A function stub

Lower level file i/o functions, Lower Level File I/O Functions: Whenev... 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

Persistent variables, Persistent Variables: Generally, whenever a func... Persistent Variables: Generally, whenever a function stops executing, then the local variables from that function are cleared. That means that each and every time a function i

Example of customizing plots, Example of customizing plots: As the oth... Example of customizing plots: As the other illustration of customizing plots, the pieces of a pie chart can be "exploded" from the rest. In this situation, the two vectors are

Need of a nested loop, Need of a nested loop: How would we sum each i... Need of a nested loop: How would we sum each individual column, rather than getting an overall sum? Answer: The programming technique would need a nested loop in whi

Example of functions which return values, Example of Functions which return... 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

Operation on file, Operation on file: We concentrate first on the fget... Operation on file: We concentrate first on the fgetl function that reads strings from the file one line at a time. The fgetl functions afford more control over how the data is

Generic code for reading from files, Generic code for Reading from Files: ... Generic code for Reading from Files: The generic code to complete this is as shown below:   fid = fopen('filename'); if fid == -1    disp('File open not suc

Menu function, MENU Function: The MATLAB also has a built-in function ... MENU Function: The MATLAB also has a built-in function known as menu which will display a figure Window with push buttons for the choices. The very first string passed to the

Reading from files, Reading from Files: There are many lower level fun... 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