table data

[compsystems]

Hello,
Delete the space between set and the bracket []
set [] => set[], same for polynomial poly1[], I do not know why the hpprime, when pasting the data adds a space before []


##################

Converting a rectangular array type matrix into a table
the positions start at (0,0)

Example

PHP Code:

MA:=[[9,8],
[7,3+4*i]] 


table(MA) [enter] returns

PHP Code:

table(
(0,0) = 9,
(0,1) = 8,
(1,0) = 7,
(1,1) = 3+4*i
) 


for the inverse process, that is, convert a table to a matrix, Note that this must have the form

PHP Code:

table(
(0,0) = element1,
(0,1) = element2,
...
) 


or

PHP Code:

table(
[0,0] = element1,
[0,1] = element2,
...
) 


Example

PHP Code:

matrix( 

table(
(0,0) = 9,
(0,1) = 8,
(1,0) = 7,
(1,1) = 3+4*i
) 


)

or

PHP Code:

matrix( 

table(
[0,0] = 9,
[0,1] = 8,
[1,0] = 7,
[1,1] = 3+4*i
) 
) 


[enter] returns

PHP Code:

[[9,8],
[7,3+4*i]] 


/////////////////////////


An alternative way to define tables is using ( : )

PHP Code:

d := table( "foo": 10, 9:x+y*i, "bar": 100, "baz": 1000) [enter] returns
table(
9 = x+y*i,
"bar" = 100,
"baz" = 1000,
"foo" = 10
) 


But unlike python, Xcas reorders the labels numerically and alphabetically

To extract the tag you can use FOR

PHP Code:

for k in d:
   print(k) [enter] returns

9
bar
baz
foo 


and to access the values of the label.

PHP Code:

for k in d:
    print(d[k]) [enter] returns

x+y*i
100
1000
10