Some additional helper functions#7
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| exports[`query getVariableFactors 2x^2 * z^2 + y^3 1`] = ` |
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y^3 is not a factor, it's a term. If you want a function that finds all variable factors we should have a separate function for that.
aliang8
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lib/__test__/query.test.js
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| it('isVariableFactor', () => { | ||
| it('isVariableFactor', () => { | ||
| console.log(query.isPolynomial(parse('2*(y+x)'))) |
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I think these two lines should be reverted.
lib/query.js
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| } else if(isPolynomial(node) || isApply(node)) { | ||
| } else if(isPolynomial(node) || isAdd(node) || (isMul(node) && node.args.every(isPolynomialTerm))) { | ||
| // 2x^2 + 3x + 1, 3x^2 * 2x^2 |
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Given the comment, shouldn't checking isPolynomial(node) enough since we've already ruled out constants and single term polynomials. Why are the other conditions necessary?
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I don't think so; it leaves out non-polynomial expressions such as x + 4 + x + 2^x that we would still want to collect and combine.
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Gotcha. Can you update the comment with that example?
aliang8
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| export const isRel = node => isApply(node) && node.op in relationIdentifierMap | ||
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| export const isNumber = node => { |
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I think we should keep isNumber in addition to isRationalNumber.
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Hmmm I don't see how it would be useful, but I add it back.
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I guess we isInteger. Okay, let's leave this as is. We can always add it back later if it does turn out we need it.
| assert(query.isNumber(a)) | ||
| assert(query.isNumber(parse('-2'))) | ||
| assert(!query.isNumber(x)) | ||
| it('isRationalNumber', () => { |
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Maybe add some tests that check for factions and decimals.
lib/query.js
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| // e.g 3 -> -3, -3x -> 3x, x + 3 -> -(x + 3), 2/3 -> -2 / 3 | ||
| export const negate = (node) => { |
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I think this should be part of build not query.
2 participants
getVariableFactors
2x^2 * ygetCoefficientsAndConstants
x + 4 + 2^x + 4negate
-3x -> 3xhasCoeff
2x^2 -> true, x -> false