I'm working on a heatmap which basically plots the graph between taxIDs and KeywordNames from an external JSON. While I'm able to plot the values I see many blank spaces on the graph and clueless how I can plot them with the available data.
Here's the link to codesandbox: https://codesandbox.io/s/40mnzk9xv4
On the X-Axis I'm plotting the TaxIDs which are being calculated within the given range. I did try using the function rangeBands() but I get an error everytime.
Its the similar case with Y-Axis where I'am plotting the keywordIDs which are also being calculated within a range. I'm trying to print all the KeywordNames on Y axis and all taxIDs on the X-Axis and plot their corresponding spectracount on graph.
Please help me where have I gone wrong.
The output I'm looking for is something similar to this: https://bl.ocks.org/Bl3f/cdb5ad854b376765fa99
Thank you.
Some things to help you get you one your way:
First, your scales should use scaleBand(), not scaleLinear(), as they have discrete domains (i.e. categories of something, rather than continuous)
Second, your scale domains is taking every value of taxId and keywordName in your data as a possible value. But some values are repeated more than once. You need to be filtering them so you only have unique values. So your scale code should be:
const xValues = d3.set(data.map(d => d.taxId)).values();
const yValues = d3.set(data.map(d => d.keywordName)).values();
const xScale = d3.scaleBand()
.range([0, width])
.domain(xValues); //X-Axis
const yScale = d3.scaleBand()
.range([0, height])
.domain(yValues); //Y-Axis
Finally, your code that places the heatmap tiles needs to be calling the scale functions so it works out the position of each rect correctly:
chart.selectAll('g')
.data(data).enter().append('g')
.append('rect')
.attr('x', d => { return xScale(d.taxId) })
.attr('y', d => { return yScale(d.keywordName) })
That should get you most of the way there. You'll want to also reduce cellSize and remove the tickFormat calls on the axes as they are trying to convert your text labels to numbers.
Related
Preface: I've gone through all other stackoverflow questions relating to this problem I could find, which are outdated or recommend using a ordinal scale instead. Including this one: D3 Non-Continuous Dates Domain Gives Gaps on X-Axis
which describes my problem as well.
Goal: I am trying to create a candlestick chart with zoom in/zoom out and panning. Currently the chart is working as intended, minus the x-axis (which contains dates/times of each candlestick).
I want the x axis to function like it does with scaleTime(), where it shows years/months, and when you zoom in it shows the date/time, depending on the time interval. I know timeScale() is continuous, but I need the functionality of the zooming in and out.
Problem: Gaps are included in the x-axis since when I set the domain for the x-scale and x-band, I am using the minimum and maximum dates in the dataset (named 'prices').
Code (d3js v7):
Works but x-scale is not dates, but decimal values from -1 to dates.length:
var xScale = d3.scaleTime()
.domain([-1, dates.length])
.rangeRound([0, w]);
Works x-scale is dates, but includes gaps for weekends and holidays:
var xScale = d3.scaleTime()
.domain([xmin, xmax])
.rangeRound([0, w]);
Doesn't work, x-scale is blank, coordinates are messed up:
var xScale = d3.scaleTime()
.domain(prices.map(r => r.t))
.rangeRound([0, w]);
I calculate the x coordinates for my candle bodies for (map) and [xmin,xmax] as:
.attr('x', (d, i) => xScale(d.t) - xBand.bandwidth())
or for domain([-1, dates.length])
.attr('x', (d, i) => xScale(i) - xBand.bandwidth())
xBand is declared as:
let xBand = d3.scaleBand()
.domain(d3.range(-1, dates.length))
.range([0, w])
.padding(0.2);
Another solution I can think of is to somehow convert the demical values from the domain in the first xScale example to function like the scaleTime() scale using tickFormat(), but I'm not sure how I would go about doing that. I have already converted them from decimal to dates using .tickFormat(prices.map(d => new Date(d.t))); but don't know where to go from there.
Questions: Can you pass an array of values as the domain? Or is it just a min and max value, since domain is defined as boundaries within which your data lies?
Am I passing the array mapping correctly? Is this allowed?
Finally, how can I set my domain to the array of dates I have without including gaps on the chart?
I'm trying to recreate the following in D3
And I've got the following so far: http://codepen.io/jpezninjo/pen/dNwmVK
I looked it up and the best I could find was this answer: Show every other tick label on d3 time axis?, but I'm not using a class to create each column label. I think the following two lines are the ones that control my labels, but I'm not sure how to go about this.
var x = d3.scaleBand()
.range([0, width])
.padding(0.1);
x.domain(data.map(function(d) { return d.key; }));
I'm also trying to figure out how I can put some padding on the left and right of the bars
At least two possible ways:
Make your X axis a time axis, and use d3.timeDay.every(2) to specify every 2nd day. That approach is shown here: http://codepen.io/anon/pen/YNdaRB.
Key part: var axisBottom = d3.axisBottom(x).ticks(d3.timeDay).tickArguments([d3.timeDay.every(2)]);.
To make this work, I also had to (a) make d.key equal to the result from parseDate instead of the formatted date string, (b) hard-code a width for the bars instead of using x.bandwidth(), and (c) translate the x axis by width/2 px to center it under the bars (line 94). Might be nicer ways to do (b) and (c) but I mainly wanted to show d3.timeDay.every(2)'s ability (docs).
Use your current approach but apply a style to every 2nd tick. d3 adds some classes automatically so selecting the ticks is easy. This is what they described in the post you linked to. http://codepen.io/anon/pen/qRLogy?editors=1010
Key part: d3.selectAll(".tick text").style("display", function (d, i) { return i % 2 ? "none" : "initial" })
I've been creating some charts to plot intra-day data from financial results. Often this is a value generated every ten minutes. This varies but its a good example. Therefore there are large periods of time I won't get information, eg when markets are close over weekend and between 5:00pm in the evening and 9:00pm in the morning. I've tried created a custom time scale for the x-axis but in the end the best result is to just use an ordinal scale. it works well and gives the result that I and the people reading the chart want ie, no gaps in the line plot and evenly space data points. (Its the convention)
My question is how do I know plot custom ticks on this xAxis in the correct place, given that I generate them in an array called ticks.major. The example below shows how I generate the axis and there are the correct number of days. But they all are being plotted at the beginning of the graph. Any help appreciated thanks.
var xScale = d3.scale.ordinal()
//var xScale = scaleWeekday()...custom timescale no longer used
.domain(xDomain)
.rangeBands([0,(plotWidth-yLabelOffset)])
var xAxis = d3.svg.axis()
.scale(xScale)
//.tickValues(ticks.major)//used to create tick d3 time scale axis
.tickFormat(function (d,i) {
return ticks.major[i]
})
.tickSize(yOffset/2)
.orient("bottom");
var xLabel=plot.append("g")
.attr("class",media+"xAxis")
.attr("transform",function(){
if(yAlign=="right") {
return "translate("+(margin.left)+","+(plotHeight+margin.top)+")"
}
else {return "translate("+(margin.left+yLabelOffset)+","+(plotHeight+margin.top)+")"}
})
.call(xAxis);
it looks like this:
I think the mistake I'm making is that by using the tick.major array its applying the tick value to the first 12 dates that are passed bacause thats all thats in the tick.major array. Then because there are no more dates in the tick.majore array it has no labels for any further date in the series. Its better to apply a test in the tickFormetter to see if the current day at a particular datapoint is different from the day at the previous datapoint. Then return a tick. like this
.tickFormat(function (d,i) {
if(i>0) {
var day=d.getDay()
var yesterday=data[i-1].date.getDay()
console.log(day,yesterday)
if(day!=yesterday) {
return d
}
}
})
The returned d needs a bit of date formatting to make it readable
I'm trying to create a simple scatter plot in d3 (similar to this one from matplotlib):
I use extent() to set the scale's input domain range.
xScale.domain(d3.extent(xvalues));
Using this approach results in some dots overlapping axises in d3 plot:
How to avoid axis overlapping and make a margin similar to the matplotlib's plot?
Input values vary, so simple increment / decrement of the extent() output doesn't look like a general solution.
In general, the best way of handling this is to call the scale's .nice() function, which will round the ends of the domain of the scale to nice values. In your particular case, this doesn't work, as the values are "nice" already.
In this case I would compute the extent of the domain and extend it by a fraction of that. For example:
var padding = (xScale.domain()[1] - xScale.domain()[0]) / 10;
xScale.domain([xScale.domain()[0] - padding, xScale.domain()[1] + padding]).nice();
In your matplotlib image, the dots are not overlapping and the x scale has negative value.
In d3:
var xScale = d3.scale.linear()
.domain([
d3.min(data, function(d) {
return d.val;
})-10, //so the domain is wider enough for the zero value
d3.max(data, function(d) {
return d.val;
}),
])
.range([height , 0])
I'm trying to create a bar chart with custom values for each bar along the xAxis in D3, and thought I'd try to use the tickValues. Just to try it out I gave it some dummy data but it doesn't work like this:
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom")
.tickValues(['hi','b','c','d','e']);
Here's the xScale:
gon.votes.length is an array of total votes counts for EACH answer and functionally is there only to return how many bars there will be for a specific survey question(this is a survey app fyi)
var xScale = d3.scale.linear()
.domain([0,gon.votes.length])
.range([0,w]);
Finally, when I call
function(d){ return d.title}
This will extract the appropriate title for each bar.
Also here is the html of the ticks of the xAxis that gets rendered:
NaN
Any tips on how to put this along the xAxis? Is trying to modify the ticks the wrong approach?
Ah, I see you were using a linear scale. In this case you need an ordinal scale, since the domain is a set of discrete values (the list of titles).
Working example:
http://tributary.io/inlet/5775047
There are comments in the code for the axis part.
The issue is that the range array needs to have as many values as there are labels in the domain array. Otherwise it recycles. In your case, the first label was on 0, then w, then 0, then w, and so on.
To get the titles dynamically from the array of data, you need to use the map method on the array. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map
Working example with dynamic titles:
http://tributary.io/inlet/5775215