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dag-solve's Issues

A.solve() cause Cannot read property 'set' of undefined

Why I can't A.solve();?

const DAG = require('dag-solve');

const g = new DAG();
const A = g.makeNode('A').setMath('($1 + $2) / $3')
const B = g.makeNode('B')
const C = g.makeNode('C')
const D = g.makeNode('D')

g.connect(A, g.root);
// B -> A
g.connect(B, A);
// C -> A
g.connect(C, A);
// D -> A
g.connect(D, A);

B.setMath(9);
C.setMath(6);
D.setMath(3);

Will cause

TypeError: Cannot read property 'set' of undefined
    at Node.solve (dag-solve/main.js:920:19)
    at Node.solve (dag-solve/main.js:925:19)

While g.solve() will give 5 which is correct.

What should I do if I need the intermediate value?

How setMath works?

How to determine what $1 is pointing to?
g.makeNode('A').setMath('$1 * $2 / $3')

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