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Code Issues Releases Wiki Activity

Added mathematics filter operators power and log (#5080)

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saqimtiaz 2020-11-20 15:00:20 +01:00 committed by GitHub
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14
core/modules/filters/math.js
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@ -91,6 +91,20 @@ exports.exponential = makeNumericBinaryOperator(
function(a,b) {return Number.prototype.toExponential.call(a,Math.min(Math.max(b,0),100));} function(a,b) {return Number.prototype.toExponential.call(a,Math.min(Math.max(b,0),100));}
); );
exports.power = makeNumericBinaryOperator(
function(a,b) {return Math.pow(a,b);}
);
exports.log = makeNumericBinaryOperator(
function(a,b) {
if(b) {
return Math.log(a)/Math.log(b);
} else {
return Math.log(a);
}
}
);
exports.sum = makeNumericReducingOperator( exports.sum = makeNumericReducingOperator(
function(accumulator,value) {return accumulator + value}, function(accumulator,value) {return accumulator + value},
0 // Initial value 0 // Initial value

14
editions/tw5.com/tiddlers/filters/examples/log Operator (Examples).tid Normal file
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@ -0,0 +1,14 @@
created: 20201120041503515
modified: 20201120042024813
tags: [[Operator Examples]] [[log Operator]]
title: log Operator (Examples)
type: text/vnd.tiddlywiki
Logarithm of `8` with base `2`:
<<.operator-example 1 "[[8]log[2]]">>
Logarithm of `100` with base `10`:
<<.operator-example 2 "[[100]log[10]]">>
Natural logarithm of 10 (base `e`), equivalent to `ln(10)` in mathematics:
<<.operator-example 2 "[[10]log[]]">>

8
editions/tw5.com/tiddlers/filters/examples/power Operator (Examples).tid Normal file
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@ -0,0 +1,8 @@
created: 20201120040913073
modified: 20201120041513726
tags: [[Operator Examples]] [[power Operator]]
title: power Operator (Examples)
type: text/vnd.tiddlywiki
<<.operator-example 1 "[[3]power[3]]">>
<<.operator-example 2 "9 +[power[2]]">>

15
editions/tw5.com/tiddlers/filters/log Operator.tid Normal file
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@ -0,0 +1,15 @@
caption: log
created: 20201120041113537
modified: 20201120041443518
op-input: a [[selection of titles|Title Selection]]
op-output: the logarithm of each input title as numbers, with base <<.place N>> if specified otherwise base `e`
op-parameter: a number
op-parameter-name: N
op-purpose: treating each input title as a number, return its logarithm with base equal to the numeric value of the operand if specified, otherwise base `e`
tags: [[Filter Operators]] [[Mathematics Operators]] [[Binary Mathematics Operators]]
title: log Operator
type: text/vnd.tiddlywiki
<<.from-version "5.1.23">>
<<.operator-examples "log">>

15
editions/tw5.com/tiddlers/filters/power Operator.tid Normal file
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@ -0,0 +1,15 @@
caption: power
created: 20201120040720190
modified: 20201120040852980
op-input: a [[selection of titles|Title Selection]]
op-output: the input as numbers, but with each one raised to the power of <<.place N>>
op-parameter: a number
op-parameter-name: N
op-purpose: treating each input title as a number, raise it to the power of the numeric value of the operand
tags: [[Filter Operators]] [[Mathematics Operators]] [[Binary Mathematics Operators]]
title: power Operator
type: text/vnd.tiddlywiki
<<.from-version "5.1.23">>
<<.operator-examples "power">>