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# mathematica command

Posted 10 years ago
 In a mathematica code...i read the command //Flatten; What is this command?
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Posted 10 years ago
 Actually if you type //into the Documentation center you will get the documentation for the Postfix command:http://reference.wolfram.com/language/ref/Postfix.html
Posted 10 years ago
 Thank you!!
Posted 10 years ago
 // is the short form of Postfix. In general Mathematica knows about Prefix, Infix and Postfix. Postfix means the operator or command follows the expression In[1]:= ?// Postfix[f[expr]] prints with f[expr] given in default postfix form: expr//f. Postfix[f[expr],h] prints as exprh.  >> In[2]:= (* Postfix *) {x1, {x2, {x3, {x4}}, x5, {x6, {x7, {x8}}}}, x9} // Flatten Out[2]= {x1, x2, x3, x4, x5, x6, x7, x8, x9} In[3]:= (* Prefix *) Flatten[{x1, {x2, {x3, {x4}}, x5, {x6, {x7, {x8}}}}, x9}] Out[3]= {x1, x2, x3, x4, x5, x6, x7, x8, x9} In[4]:= (* Prefix *) Flatten @ {x1, {x2, {x3, {x4}}, x5, {x6, {x7, {x8}}}}, x9} Out[4]= {x1, x2, x3, x4, x5, x6, x7, x8, x9} start your voyage into Mathematica with an understanding of Evaluation based on the fact that everything is an expression in Mathematica.One can do In[7]:= 45 \[Degree] // Cos Out[7]= 1/Sqrt[2] In[14]:= 45 ~ Times ~ Degree // Cos Out[14]= 1/Sqrt[2] this expression system is based on the fact that there are unary, binary, ternary, .... operators in mathematics. Minus is an unary operator, Plus is a n-ary one In[18]:= 7 ~ Plus ~ (5 // Minus) Out[18]= 2 In[19]:= 1~Plus~2~Plus~3~Plus~4~Plus~5 == Plus @@ Range[5] == Plus[1, 2, 3, 4, 5] Out[19]=True 
Posted 10 years ago
 It' s not Flatten(x) or another command. IT'S ONLY //Flatten; in the reference o documentation center there is no explanation. For example what does it mean // ? So, if you want to help me, link specific post for my problem or if you known it explain it. Thanks.
Posted 10 years ago
 The Documentation Center is your friend.
Posted 10 years ago
 See Flatten in the reference.
Posted 10 years ago
 In[1]:= Flatten[{{a, b}, {c, {d}, e}, {f, {g, h}}}] Out[1]= {a, b, c, d, e, f, g, h}