stata کد loop و جدا سازي

شرح پروژه

سلام يک کد لازم در استاتا است براي دو  موضوع ذيل 

يکي در خصوص factorial

دومي  براي ذخيره و جدا سازي اسامي در کد استانا  که مي توان از  از substr استفاده کرد 

substr function!

 Dabir: https://www.stata.com/manuals15/m-5substr.pdf

ماکروهاي مورد نياز 

the factorial of a given macro! Do not 

* forget that in a strict sense, the domain of factorial is the set of 

* (positive) natural numbers.

* Write a piece of code that stores your or someone else's name in a macro, and

* then first outputs its first letter, then the second, up until the end of the

ساير اطلاعات  اوليه  و ...

Basic programming elements                          *

****************************

* Macro variables can store different values

* Local macros are cleared after execution

local i = 1

disp `i'

* Local macros can have string values

local s "And deep beneath the rolling waves"

disp "`s'"

disp `s'

* Values of global macros are stored after execution

global t "In labyrinths of coral caves"

disp "$t"

macro list

macro list t

* Concatenation of string with plus sign

local u = "$t" + "An echo of a distant time"

disp "`u'"

* Combining different types

local score = 100

disp "I will score `score'% on the test"

* Double quotes

local q `"Comes "willowing" across the sand"'

disp `"`q'"'

* Making calculations

local a = 5

local b = 6

disp `=`a' + `b''

disp "a + b = `=`a' + `b''"

* Values of a dataset can be accessed

sysuse auto

disp `=price[1]'

disp "`=make[2]'"

* The _N constant stores the number of observations

disp _N

disp `=price[_N - 1]'

****************************

*                             If clauses and loops                             *

****************************

* Simple if clauses

local a = 5

local b = 6

* Programming if is different than conditional if

if `a' > `b' {

 disp "`a' > `b'"

}

else {

 disp "`b' > `a'"

}

* Be careful with numericals stored as string

if "2" > "19" {

 disp "Careful with strings!"

}

* More complex conditions

local a = 5

local b = 6

if (`a' != `b' & mod(`b', 2) == 0) {

 disp 2 * `b'

}

* For loop for values

forvalues i = 1/5 {

 disp `i'

}

* Different steps

forvalues i = 10(-2)0 {

 disp `i'

}

* For loop for variables

foreach v of varlist _all {

 disp "`v'"

 disp "`=`v'[1]'"

}

* For loop for macros

local words "And everything is green and submarine"

foreach w of local words {

 disp "`w'"

}

* Other types of loops

foreach i in 1 4 "apple orange" 132 car {

 disp "`i'"

}

* name!

مهارت ها و تخصص های مورد نیاز

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