See ?selection on the online help for more info.

> lst:=[seq([seq(i+10*j,i=1..5)],j=1..4)];

 lst := [[11, 12, 13, 14, 15], [21, 22, 23, 24, 25], [31, 32, 33, 34, 35], 

   [41, 42, 43, 44, 45]]

> lst[1..,2]; # Take the second column of each row

                              [12, 22, 32, 42]

Regards, -- Jean-Marc

This occurs only if the identity is on the right-end of an expression that contains more that two elements and is not surrounded by parentheses .

> restart;
> define('`&*`','multilinear','flat','identity'=1);
> (a &* b) &* c - a &* (b &* c);
                                      0
> a &* 1;
                                      a
> 1 &* a;
                                      a
> 1 &* a &* b;
                                   a &* b
> a &* 1 &* b;
                                   a &* b
> a &* b &* 1;
                                 &*(a, b, 1)
> a &* (b &* 1);
                                   a &* b

Regards, -- Jean-Marc

This occurs only if the identity is on the right-end of an expression that contains more that two elements and is not surrounded by parentheses .

> restart;
> define('`&*`','multilinear','flat','identity'=1);
> (a &* b) &* c - a &* (b &* c);
                                      0
> a &* 1;
                                      a
> 1 &* a;
                                      a
> 1 &* a &* b;
                                   a &* b
> a &* 1 &* b;
                                   a &* b
> a &* b &* 1;
                                 &*(a, b, 1)
> a &* (b &* 1);
                                   a &* b

Regards, -- Jean-Marc

define() accepts expressions and procedures in addition to keywords, so the distributivity law of &* over + could be defined as follows:

> define('`&*`','multilinear',a &* (b + c) = (a &* b) + 
(a &* c),'flat','identity'=1);

> x &* (y + z);
                               x &* y + x &* z

> 2 &* (3 + a);
                                   6 + 2 a

Regards, -- Jean-Marc

define() accepts expressions and procedures in addition to keywords, so the distributivity law of &* over + could be defined as follows:

> define('`&*`','multilinear',a &* (b + c) = (a &* b) + 
(a &* c),'flat','identity'=1);

> x &* (y + z);
                               x &* y + x &* z

> 2 &* (3 + a);
                                   6 + 2 a

Regards, -- Jean-Marc

I believe you mean something like that:

restart;
mu := 5.0; sigma := 2.0; 
X1 := RandomTools:-Generate(list(distribution(Normal(mu, sigma)), 1100)); 
K1 := select(proc (x) options operator, arrow; 0 <= x and mu-3*sigma <= x
and x <= mu+3*sigma end proc, X1)[1 .. 1000]; 
nops(X1); nops(K1);

                                    1100
                                    1000

Regards, -- Jean-Marc

I believe you mean something like that:

restart;
mu := 5.0; sigma := 2.0; 
X1 := RandomTools:-Generate(list(distribution(Normal(mu, sigma)), 1100)); 
K1 := select(proc (x) options operator, arrow; 0 <= x and mu-3*sigma <= x
and x <= mu+3*sigma end proc, X1)[1 .. 1000]; 
nops(X1); nops(K1);

                                    1100
                                    1000

Regards, -- Jean-Marc

You could also use the interactive matrix browser. Regards, -- Jean-Marc

You could also use the interactive matrix browser. Regards, -- Jean-Marc

Regards, -- Jean-Marc

Regards, -- Jean-Marc

You can find the answers to your questions about Maple syntax and functions in the online help. You can either browse the online documentation or search for specific topic or keywords in the left-hand pane. For instance, type trunc and hit the button labeled "Search". Also, you can access specific pages related to a function by evaluating the question mark operator ? followed by some topic or function name. For instance, will bring you to Regards, -- Jean-Marc

You can find the answers to your questions about Maple syntax and functions in the online help. You can either browse the online documentation or search for specific topic or keywords in the left-hand pane. For instance, type trunc and hit the button labeled "Search". Also, you can access specific pages related to a function by evaluating the question mark operator ? followed by some topic or function name. For instance, will bring you to Regards, -- Jean-Marc

Regards, -- Jean-Marc

Regards, -- Jean-Marc