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Hi Mark, A If you I want to hold more information together (x, y, date, ...), using an Object may be a good solution (that makes it explicit what value has what meaning, instead of relying on the position of a value in a Pair, Tuple, or Array. Would something like this work for you? |
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It depends on how you recognize what a PairType is, your |
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Having a type that can represent either a point, or a horizontal line, or a vertical line, but nothing else, sounds like a really weird choice to me. If we get around to adding more comfortable tools for geometry to mathjs, I would imagine it more like this: plane = EuclideanSpace(2)
ptA = plane.point(2, 3)
ptB = plane.point(4, 5)
line1 = plane.line(A, B)
line2 = plane.axis[1]However, experimenting with the parser and type checker sounds like fun, so I'm looking forward to the results of your work :) |
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It'll become clearer the more I work with it. I needed something to represent a "series" of data which is basically a collection of "points". I am hoping it becomes clearer the more I delve into it... I am currently working on the UI at the moment so no progress has been made that I can share - apart from the changes I made to the expression parser to support the new fundamental type. Single Point: a = (1,3) My next step is to start incorporating this with my desired output which is a "Dataframe" / "Series". I also haven't called it a Point. I have called it a "Tuple" and it supports an ordered list of "n" items. Once it is clearer I will share the work - I am definitely not finished and something will come of this as I need this capability and I have searched high and low for a solution (without resorting to another language - I have tried Python and C++ as well - I like the simplicity of the single language but performance may decide when I start feeding large datasets into). In regards to how much data I am envisaging I will need to handle: around 500,000 data points over a year per channel. There are approximately 10 channels that I need to deal with concurrently. This will represent a year, there is the option to change this range to a smaller value or longer value. Time will tell but I'll keep you posted with my progress (after I sort out the UI which is not one of my strengths). |
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I've been working with the concept a little more now, even to the point of creating this new data type called Pair although I am not 100% certain that is the way I want to go. Sticking to out of the box functionality, I am going to investigate the object approach in more detail. One area I am looking for some advice on is the handling of this object for built-in functions such as add, sum, mean, etc. Following this article, https://mathjs.org/examples/advanced/custom_datatype.js.html, I would like to extend the functionality of some of the core functions such as add, divide, sum, mean, etc. The issue I am finding is when I attempt to create a new function when dealing with arrays I get the following error: I understand what the error is indicated but I need to handle the Array of "my type" but I would like to retain the existing implementation. Or maybe I am not understanding how the typed-function implementation works and you can indeed provide multiple functions depending on the type of the object within the array. Any suggestions? |
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This error occurs when you - like the message says - have defined the same signature twice, like: const myFunction = typed('myFunction', {
'Array': (arr) => { ... },
'Array': (arr) => { ... }
})Typed function simply can't know which one of the two to execute. If you still need the original signature, you will have to replace the old signature with a new one which handles both cases some way. Alternatively, you can maybe create a differing type than |
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Background
I am considering adding a new type called "Pair" (among other changes) to represent an x,y coordinate that I would then like to use in a graph/chart to create one or more series.
var1 = (1,2) // x,y coordinates
var2 = (,3) // y coordinates specified - represents horizontal line
var3 = (3,) // x coordinates specified - represents vertical line
These points may not necessarily be a numeric for the x or the y as I would like to introduce a date and time data type and potentially others down the track. Also, I would then proceed and add support to the relevant functions to support the operations on this data type.
Hopefully I have set the background of what I am looking at achieving.
Question
Based on the background of what I am trying to achieve, I would like to understand the following:
I guess I am looking for thoughts on this before I go off and implement it and potentially see if there are other thoughts that could achieve the above without writing a heap of code.
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