Ad5001
166d1a2485
Some checks reported errors
continuous-integration/drone/push Build was killed
Also a few bugfixes and added documentation
96 lines
3.6 KiB
JavaScript
96 lines
3.6 KiB
JavaScript
/**
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* LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
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* Copyright (C) 2022 Ad5001
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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.pragma library
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.import "common.js" as C
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.import "expression.js" as Expr
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.import "../utils.js" as Utils
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.import "../math/latex.js" as Latex
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/**
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* Represents mathematical object for sequences.
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*/
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class Sequence extends Expr.Expression {
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constructor(name, baseValues = {}, valuePlus = 1, expr = "") {
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// u[n+valuePlus] = expr
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super(expr)
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this.name = name
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this.baseValues = baseValues
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this.calcValues = Object.assign({}, baseValues)
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this.latexValues = Object.assign({}, baseValues)
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for(var n in this.calcValues)
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if(['string', 'number'].includes(typeof this.calcValues[n])) {
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let parsed = C.parser.parse(this.calcValues[n].toString()).simplify()
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this.latexValues[n] = Latex.expression(parsed.tokens)
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this.calcValues[n] = parsed.evaluate(C.evalVariables)
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}
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this.valuePlus = parseInt(valuePlus)
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}
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isConstant() {
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return this.expr.indexOf("n") == -1
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}
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execute(n = 1) {
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if(n in this.calcValues)
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return this.calcValues[n]
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this.cache(n)
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return this.calcValues[n]
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}
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simplify(n = 1) {
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if(n in this.calcValues)
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return Utils.makeExpressionReadable(this.calcValues[n].toString())
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this.cache(n)
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return Utils.makeExpressionReadable(this.calcValues[n].toString())
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}
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cache(n = 1) {
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var str = Utils.simplifyExpression(this.calc.substitute('n', n-this.valuePlus).toString())
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var expr = C.parser.parse(str).simplify()
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var l = {'n': n-this.valuePlus} // Just in case, add n (for custom functions)
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l[this.name] = this.calcValues
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C.currentVars = Object.assign(l, C.evalVariables)
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this.calcValues[n] = expr.evaluate(C.currentVars)
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}
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toString(forceSign=false) {
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var str = Utils.makeExpressionReadable(this.calc.toString())
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if(str[0] != '-' && forceSign) str = '+' + str
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var subtxt = this.valuePlus == 0 ? 'ₙ' : Utils.textsub('n+' + this.valuePlus)
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var ret = `${this.name}${subtxt} = ${str}${this.baseValues.length == 0 ? '' : "\n"}`
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ret += Object.keys(this.baseValues).map(
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n => `${this.name}${Utils.textsub(n)} = ${this.baseValues[n]}`
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).join('; ')
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return ret
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}
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toLatexString(forceSign=false) {
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var str = this.latexMarkup
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if(str[0] != '-' && forceSign) str = '+' + str
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var subtxt = '_{n' + (this.valuePlus == 0 ? '' : '+' + this.valuePlus) + '}'
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var ret = `\\begin{array}{l}${Latex.variable(this.name)}${subtxt} = ${str}${this.latexValues.length == 0 ? '' : "\n"}\\\\`
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ret += Object.keys(this.latexValues).map(
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n => `${this.name}_{${n}} = ${this.latexValues[n]}`
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).join('; ') + "\\end{array}"
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return ret
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}
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}
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