generate an algebraic formula for a sequence
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seqsolve

generate an algebraic formula for a sequence

build status

browser support

example

command-line

$ seqsolve 11 44 99 176 275 396 539
((n*(11))*(n))
$ seqsolve -n 20 -e '((n*(11))*(n))'
11
44
99
176
275
396
539
704
891
1100
1331
1584
1859
2156
2475
2816
3179
3564
3971
4400
$ seqsolve -c 11 15 20 26 33
53
69
88
109
133
159
188
219
253
289
328
369
413
459
508

api

var solve = require('seqsolve');
var f = solve([ 2, 4, 8, 16, 32 ]);
var xs = [ 10, 11, 12 ].map(f);
console.dir(xs);

Generate an algebraic expression of an index variable n starting at 1 given a sequence.

methods

var seqsolve = require('seqsolve')

var f = seqsolve(xs)

Generate a function f(n) to compute digits for each index n starting from 1.

var terms = seqsolve.solve(xs)

Generate a serializable array representing the algebraic data structure of the underlying computation. There is an implied leading n term.

Example:

$ node -pe "require('seqsolve').solve([3,6,11,18,27,38])"
[ [ '*', 'n' ], [ '+', 2 ] ]

var f = seqsolve.eval(terms)

Compile the terms from seqsolve.solve() into a function f.

Example:

$ node -pe "require('seqsolve').eval([ [ '*', 'n' ], [ '+', 2 ] ]).toString()"
function anonymous(n) {
return ((n*(n))+(2))
}

install

With npm, to get the library do:

npm install seqsolve

and to get the command, do:

npm install -g seqsolve

todo

license

MIT