Support for x values (instead of x indices)

[onyame]

Support for x values (instead of x indices)

[PhilJay]

Within the next few weeks v3.0.0 of this library with major changes will be released which is finally going to close this issue, stay tuned :-)

[bhspencer]

I am looking for an android equivalent to to vis.js graph2d http://visjs.org/graph2d_examples.html

[SoftwareRancher]

+1

I was really impressed with the capabilities of MPAndroidChart but since it's not possible to enter data as (x,y) pairs I can't use it. My application has real-time time-series data with irregular/unpredictable time coordinates for each measurement.

[forkch]

+1
this is unfortunately a blocking issue for using this great library for our project.
We would definitively donate a good amount if we could use this library.

[PhilJay]

Yes, & the latest release.

[PhilJay]

You are absolutely right, that is kind of a drawback. I work on providing a solution for this issue as fast as possible.

Nevertheless, the charts displayed in your link are already possible (quite likely with some additional but manageable effort).
As a description for the x-axis, you can provide an array of Strings representing each day of the year, meaning 365 entries.
The index on which an actual value will be displayed on can then depend on the day.

Example: Blood pressure 139 measured on January 10th.
--> x-axis index 9
Blood pressure 139 measured on February 2nd.
--> x-axis index 32

It is not necessary that each possible index on the x-axis (ranged from 0 to 365) is bound to a value.

I hope this helps a little bit, regards
Philipp

[onyame]

Hi, Philipp,
we did the workaround that you described. But this does not work for large number of x-values. It just takes too much time.
For example, we need to plot values for about 10 years and we have more than one value per day (sometime >20 values per day).
So, it still would be great if you could support for time series.
best regards
Andreas

[AndroidGecko]

+1

[SiyiLi]

+1, looking forward to seeing this feature, the sooner the better : )

[skadyrov]

+1, I am looking for the same feature as well

[nesterov-n]

+1. Very useful feature

[pgmo]

Just looking for the same feature. Great work, anyway!

[subairariyil]

Thanks for the great library. It would be great if you add this feature asap

[oinegue]

+1. I'd love this feature!

[nekdenis]

Thanks for cool library!
Maybe anyone already make this feature possible?
@PhilJay Are you working on this feature ? I've got some ideas how to make it real.

[dowi]

+1, I am looking for the same feature as well

[rajatdeshpande]

Hi Guys,

@nekdenis - Could you please discuss the ideas here, I would be glad to contribute using your ideas :)

Thanks,

[Ploppy3]

+1 same here

[medy75]

+1

[rajatdeshpande]

+1
On Feb 28, 2015 9:22 PM, "Jaroslav Medek" [email protected] wrote:

+1

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[bhspencer]

+1

[taltstidl]

+1

[nekdenis]

https://github.com/nekdenis/MPAndroidChart/tree/decart
I've implemented this feature. But here are one bad thing: I'm not using existing data model.
If someone need example usage of this graph I could add it.

[palasjir]

+1

[Robyer]

+1

[webventil]

+1

[j0d5]

+1

[dhofmann404]

+1

[idellwig]

+1

[burix]

+1 man come on it is awesome!!!

[enffichris]

Indeed this would make this library the best! Otherwise it already excels

[mathieudebrito]

+1

[rajatdeshpande]

+1

On Tue, Apr 21, 2015 at 3:23 PM, Mathieu De Brito [email protected]
wrote:

+1

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Rajat Deshpande
Mechanical Engineering
IIT BOMBAY

[FranzBusch]

+1

[enffichris]

@SoftwareRancher You should be able to do this. You can use e.g. a unix-timestamp type of datasystem.
Only drawback is that you are limited in resolution depending on how large you want your vector to become.

[SoftwareRancher]

It looked to me (from the API) that the "x values" were basically labels
and would not affect the position of the data on the graph. I need a
set of data points such as

(0, 1), (45,1), (50, 2), (55, 1), (100, 1)

to appear like:

On 04/27/2015 02:52 PM, enffichris wrote:

@SoftwareRancher https://github.com/SoftwareRancher You should be
able to do this. You can use e.g. a unix-timestamp type of datasystem.

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Jim

[SrMouraSilva]

+1

[matejcikm]

+1

[wangningdy]

+1

[marctatham]

• 1

[rascheC]

+1
any news?

[elmarcoh]

+1

[fountaingeyser]

👍 @PhilJay @danielgindi Thanks for the great library! Yet this feature would make it perfect. So I (and I think many others too) would really appreciate it if this feature would come any time soon...
Please keep us posted. Thanks a lot!

[enffichris]

Considering the amount of people who would love this feature. Would it make sense to crowdfund it? How much would be required - if that's an option at all for you @PhilJay

[puuro]

+1
@nekdenis
Can you add an example usage of your graph. I didn't find it anywhere.

[learnerbyheart]

+1

[mvojtkovszky]

+1

[SergioEscuder]

+1

[9and3r]

The library is great. I am using it on my final degree project and I would love to use this feature.

Currently I found a way to use it with not equidistant values even with large values (I tested up to 30000 and there is no problem as the strings are created dynamically) but when you zoom in, the lines on the edges sometimes get invisible #801.

In case someone is interested this is the class I use to replace the strings array:

The other methods that needs to be implemented from List are left with the default implementation:

public class MaxList implements List<String> {

    private int max;

    public MaxList(){
        max = 0;
    }

    @Override
    public void clear() {
        max = 0;
    }

    @Override
    public String get(int i) {
        if (i<1000){
            return String.valueOf(i) + "m";
        }else{
            return String.valueOf(i/1000)+","+String.valueOf(i%1000)+"km";
        }
    }

    @Override
    public int size() {
        return max+1;
    }

    public void addMax(int new_max){
        if (new_max > max){
            max = new_max;
        }
    }

    @Override
    public boolean isEmpty() {
        return false;
    }
}

Remember to set the max value of your data.

Hope it helps someone and thanks for the great library!

[sowrabh]

+1, this is a much needed feature. Would be happy to contribute.

[subhanshuja]

+1

[micnguyen]

+1 Huge missing use case. Has anyone bolted on this functionality in a nice way?

I basically hacked up a solution by creating intervals/indices for 1 second, so viewing a graph over a day is 60 * 60 * 24 intervals where the data points are x-intervals away from my start time.

[bomiyr]

+1

[Mashnin]

+1

[knseir]

+1

[prabel]

+1

[Brian0122]

＋1

[doom369]

+1

[prateekdwv]

+1 for this feature
That's exactly what I was looking for.

[forum6691]

+1 for this feature which will have multiple applications to display various scientific data.

[amandeepgautam]

+1 for the feature

[knseir]

@PhilJay Hi Philipp, any news on this ?
I need to show time on the x-axis, but in multiples of 5 minutes (00 - 15:00 - 30:00 as opposed to 00-
14:38, etc...)
Thank you!

[alexpell00]

+1

[ranj27]

Is this feature available yet?I am looking for such time series as well. Wonderful library

[zdesiree]

+1

[zjuhasz]

Yep +1! Please save us @PhilJay

[JohanCosemans]

+1 for this feature

[funkvps]

Hello, could you please add examples for this? @nekdenis

[mehdi-shiba]

Using the great port of this already great library on iOS. Would love to have support for XY charts!

[mohitagrawal]

+1 This would be a great improvement to the library. XY coordinate is kind of basic of graphing system and its sad that this library doesn't support that.

[adek]

Yes. I hope you'll be able to add timeseries in future.
I've switched to your library and this is something that is missing. Previously I've been using aChartEngine.

At the moment I'm using simple indexing method. I've got only days so it's pretty simple. But probably there is a better way of doing that.

[cerebrahm]

+1 for this feature. It is indeed a great library. Would love to see support for float values in x axis.

[ff0o0]

I have the same question. So i change my x values to be equidistant and set to x Axis. Although it looks
work, the callback OnChartValueSelectedListener.onValueSelected can't be called exactly. I'm still finding solution.
@PhilJay any advices? thanks.

[binujayaram]

+1

[nilslukas]

+1

[tripplemac]

+1

[mat90c]

+1

[refaelsh]

+1

[apatrone]

+1

[rlimberger]

We are also just starting to integrate iOS Charts, great library, thank you. We are running into this limitation as well. We have xValues like 0, 0.2, 3, 5.75, 6.5, 10, 40, 66.7. Using the workaround described, we would have to have xValues every 0.1 steps, which would be a lot, to cover a range of 0-600 for example.

Any news on this feature or some other work around that performs well at larger numbers of values?

Thanks.

[pluscubed]

@PhilJay I think, as a first step, the graph should respect the x-indices put into Entry. It could do this by automatically splitting the graph into [highest x-index] number of increments, then plotting the sparse array of x-indices.

That would allow for relative x-value positioning without instantiating large arrays, which I think is adequate for the majority of use cases here. The drawback is the labels are still attached to the x-indices, as opposed to an actual xy Cartesian graph, but this solution would still be much better than what is available currently.

EDIT: I believe I was mistaken in how the x-indices of Entry work, which actually behaves as I described. I suppose the remaining issue would be the x labels, which should optimally also work with indices to minimize memory impact.

[MGasztold]

+1 this feature is extra needed

[RyGuyM]

+1

[cgathergood]

+1

[mazzonem]

+1

[stevekelly20]

+1

[sschale]

+1

[johnfrey99]

+1

[dalewking]

+1

[MarioGravel]

+1 I'm logging data from events so the xAxis is variable and time based.

[Philipp2405]

+1
Great library!
I would really appreciate this feature too.

[Datalization]

+1

[MonStar1]

+1

[TeunKooijman]

+1

+1 @PhilJay

[shohiebsense]

in the name of mankind sir, +1

[biovolt]

+1

[forum6691]

Information very interesting :)
Cyril

Le 10/06/2016 à 16:05, Philipp Jahoda a écrit :

Within the next few weeks v3.0.0 of this library with major changes
will be released which is finally going to close this issue, stay
tuned :-)

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[FabianTerhorst]

@PhilJay this branch https://github.com/PhilJay/MPAndroidChart/tree/remove_xindices ?

[rlimberger]

This issue being closed, does this mean that the master branch has this implemented now?