the language that we write in houdini (for example in expression ) like this:
stamp(string scop,string token,float value) what is the name of this language and please tell to me the refrence for educating this languge like books or site

hscript is the name of language which is Houdini's native language.
Help Document is best resource. Python Scripting with the Houdini Object Model (HOM) is new and preferred over HScript.

Python Scripting with the Houdini Object Model
http://www.sidefx.com/docs/houdini13.0/hom [sidefx.com]

HScript commands
http://www.sidefx.com/docs/houdini13.0/commands [sidefx.com]

Expression functions
http://www.sidefx.com/docs/houdini13.0/expressions [sidefx.com]

saeed33
the language that we write in houdini (for example in expression ) like this:
stamp(string scop,string token,float value) what is the name of this language and please tell to me the refrence for educating this languge like books or site

It's expression , now we have two different type of expressions :

1. Old Houdini Expressions
2. Python Houdini Expressions


HScript and Expressions are different , Also each one has different functions and commands !

Expressions Functions :
http://www.sidefx.com/docs/houdini13.0/expressions/ [sidefx.com]

HScript Commands :
http://www.sidefx.com/docs/houdini13.0/commands/ [sidefx.com]

We write Expressions usually in the parameters and Write HScript usually in the Window->HScript Textport

But you can execute Expressions in the Textport with echo command and run Hscript in the Expressions with execute function !
:wink:

Expressions and HScript are very close together (maybe they are same in the syntax , but they are different in commands and functions) , they are pretty like to MEL and Expressions in the Maya , we can use same syntax for conditions and loops in both , But we should use frame word to take current frame in the expressions and we should use currentTime -q; to take frame in the Script editor !

Also I suggest you to check this Topic too :

https://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&p=162965#162965 [sidefx.com]