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+--- Thread: table data (/thread-12477.html)
table data - compsystems - 02-22-2019 12:23 AM
Hello,
Python has an object type called DICTIONARY that in xcas / hpprime is table(), but python, only manages a few types of data in relation to xcas, which can operate with many more and powerfull math types.
Examples of use
PHP Code:
tblA := table( "float_1" = 5.0 , "integer_2" = 5, "complex_4" = 3+4*i, "identifier_6" = var01, "list_7" = [9,[8,7],[6,5,4]], "symbolic_8" = x+y*i , "rational_9" = 3/4, "string_12" = "Hello", "set_2" = set[ a, b ,a, c ], "polynomial_10" = poly1[ 1, -6, 11, -6 ] , "matrix" = [[1,2],[3,4]], "vector" = [9,8,7,6,5,4], "function_13" = f(x):=x+1 )
[enter] returns
table( … )
tblA[ "float_1" ], tblA[ "integer_2" ], tblA[ "complex_4" ], tblA[ "identifier_6" ], tblA[ "list_7" ], tblA[ "symbolic_8" ], tblA[ "rational_9" ], tblA[ "string_12" ], tblA[ "function_13" ], tblA[ "set_2" ], tblA[ "polynomial_10" ], tblA[ "matrix" ], tblA[ "vector" ]
[enter] returns
5.0,5,3+4*i,var01,[9,[8,7],[6,5,4]],x+i*y,3/4,"Hello", (x)->x+1,set[a,b,c],poly1[1,-6,11,-6],[[1,2],[3,4]],[9,8,7,6,5,4]
type( tblA[ "float_1" ] ), type( tblA[ "integer_2" ] ), type( tblA[ "complex_4" ] ), type( tblA[ "identifier_6" ] ), type( tblA[ "list_7" ] ), type( tblA[ "symbolic_8" ] ), type( tblA[ "rational_9" ] ), type( tblA[ "string_12" ] ), type( tblA[ "function_13" ] ), type( tblA[ "set_2" ] ), type( tblA[ "polynomial_10" ]), type( tblA[ "matrix" ]), type( tblA[ "vector" ]), type( tblA)
[enter] returns
Xcas:
real, integer, complex, identifier, vector, expression, rational, string, func, vector, vector, vector, vector, DOM_MAP
hpprime:
DOM_FLOAT, DOM_INT, DOM_COMPLEX, DOM_IDENT, DOM_LIST, DOM_SYMBOLIC, DOM_RAT, DOM_STRING, DOM_FUNC,DOM_LIST, DOM_LIST, DOM_LIST, DOM_LIST, DOM_MAP
[ type( tblA[ "float_1" ] ), type( tblA[ "integer_2" ] ), type( tblA[ "complex_4" ] ), type( tblA[ "identifier_6" ] ), type( tblA[ "list_7" ] ), type( tblA[ "symbolic_8" ] ), type( tblA[ "rational_9" ] ), type( tblA[ "string_12" ] ), type( tblA[ "function_13" ] ), type( tblA[ "set_2" ] ), type( tblA[ "polynomial_10" ]), type( tblA[ "matrix" ]), type( tblA[ "vector" ]), type( tblA) ] .+ 0
[enter] returns
[1,2,4,6,7,8,10,12,13,7,7,7,7,17]
tblA[ "list_7" ][0] [enter] returns
9
tblA[ "list_7" ][[1]] [enter] returns
9
RE: table() data - toml_12953 - 02-22-2019 04:00 PM
I get a syntax error and the cursor points after the var01 here:
tblA := table( "float_1" = 5.0 , "integer_2" = 5, "complex_4" = 3+4*i, "identifier_6" = var01
RE: table() data - compsystems - 02-22-2019 07:33 PM
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
)
)
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