Can somebody please Explain why I got this Error by running this code using MATLAB

Hello People, I'm trying to run this using MAtlab and got this error "Undefined function 'huffmandict' for input arguments of type 'double'". Can sb tell or explain me why this error and what can I do to solve this problem???

symbols = [1:5]; p = [.3 .3 .2 .1 .1]; [dict,avglen] = huffmandict(symbols,p) samplecode = dict{5,2} % Codeword for fifth signal value

"Undefined function 'huffmandict' for input arguments of type 'double'"

Answer 1

[per isakson]

Do you have the Communication Toolbx on your system? Try

>> which huffmandict
>> ver comm

I get these responses

>> which huffmandict
C:\Program Files\MATLAB\R2012a\toolbox\comm\comm\huffmandict.m
>> ver comm
-------------------------------------------------------------------------------------
MATLAB Version: 7.14.0.739 (R2012a)
MATLAB License Number: xxxxxx
Operating System: Microsoft Windows 7 Version 6.1 (Build 7601: Service Pack 1)
Java Version: Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) 64-Bit Server VM mixed mode
--------------------------------------------------------------------------------------
Communications System Toolbox                         Version 5.2        (R2012a)

[Walter Roberta]

I think I don't have it because I've got this answer below

which huffmandict ver comm 'huffmandict' not found. ------------------------------------------------------------------------------------------------ MATLAB Version: 7.14.0.739 (R2012a) MATLAB License Number: STUDENT Operating System: Microsoft Windows 7 Version 6.1 (Build 7601: Service Pack 1) Java Version: Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot™ Client VM mixed mode ------------------------------------------------------------------------------------------------ Warning: No properly formatted Contents.m file was found for 'comm'. > In ver at 47

Now what should I do to get it?????????????????

[per isakson]

Depends on what kind of license you have

• With students edition buy it as an add-on

http://www.mathworks.se/academia/student_version/companion.html

[Walter Roberta]

thanks Isakson, I got it

Answer 2

[Jason Ross]

Do you have the toolbox installed that has this function? If you type "ver" at the command prompt, you should see "Communications System Toolbox"

You and also use "which" to see where the function is coming from to make sure there's not another one on your path that might be getting in the way.

[Walter Roberson]

Note: Communications Systems Toolbox is not one of the products included as part of the Student Version; it is, though, available at extra cost.