fetching data from csv

[James]

Hi,

I have .csv file with following content:

11/13/2017 00:10:00,0,69.8,1.53,0,0.0,0.0,
11/13/2017 00:20:00,0,69.8,1.43,0,0.0,0.0,
11/13/2017 00:30:00,0,69.8,1.50,0,0.0,0.0,
11/13/2017 00:40:00,0,69.7,1.53,0,0.0,0.0,
11/13/2017 00:50:00,0,69.7,1.50,0,0.0,0.0,
11/13/2017 01:00:00,0,69.6,1.46,0,0.0,0.0,
11/13/2017 01:10:00,0,69.6,1.54,0,0.0,0.0,

How has this part of the code to be modified to get between 4 and 8 lines?

var dataPoints = [];

function getDataPointsFromCSV(csv) {
var dataPoints = csvLines = points = [];
csvLines = csv.split(/[\r?\n|\r|\n]+/);

for (var i = 0; i < csvLines.length; i++)
if (csvLines[i].length > 0) {
points = csvLines[i].split(“,”);
dataPoints.push({
x: parseFloat(points[0]),
y: parseFloat(points[1])
});
}
return dataPoints;
}

Thank you for any help!

• This topic was modified 7 years, 11 months ago by James. Reason: added notify
• This topic was modified 7 years, 11 months ago by Vishwas R.

[Indranil]

James,

To get data between line number 4 and 8, you need to start the “for loop” from 5 and run it till 7.

for (var i = 5; i <= 7; i++)

___________
Indranil Deo,
Team CanvasJS

[James]

sorry that was wrong from my side.

What I mean is:…code to be modified to get the columns between 4-8 ?

[Indranil]

James,

Can you please explain what do you mean by the columns between 4 – 8?

Since each line in your CSV is in the format:
["11/13/2017 00:10:00", "0", "69.8", "1.53", "0", "0.0", "0.0", ""] you can access the columns between 4 & 8 i.e. columns 5, 6, & 7 by accessing the array elements points[4], points[5] & point[6] respectively. But in your CSV data all these columns are zero.

Also x: parseFloat(points[0]) won’t work as expected as the first element in the array of your CSV data is a date-time value.

Please create a jsfiddle and brief us more about your requirement so that understand you requirement better and help you out.

___________
Indranil Deo,
Team CanvasJS

[James]

Hi Indranil,

I have a better .csv now:

Date,Sensor (S11),Sensor Temperature (S12),Sensor (S21),FlowMeter Total (D2),Output (A1),Output (A2)
,CCond,Temp,pH,Flowmeter,Retrans,Prop
,µS/cm,°F,,gal,%,%
11/16/2017 00:10:00,880,69.7,8.32,0,8.8,65.8,
11/16/2017 00:20:00,881,69.7,8.31,0,8.8,65.8,
11/16/2017 00:30:00,882,69.6,8.32,0,8.8,65.9,
11/16/2017 00:40:00,884,69.5,8.32,0,8.8,66.0,

I would need column 4,5,6,7 in 1 chart as multiple lines.
All samples and documentation “Creating Charts from CSV” shows only an ONE line-chart.
I have no idea how the code should look for 4 or more lines in 1 chart.
Do you have any example for this?

[Indranil]

James,

Please have a look at this jsfiddle.

__________
Indranil Deo,
Team CanvasJS

[James]

Many thanks for this :)

[santossg]

Hello,

I’m trying to create a chart from two different csv files.

In the image you can see the blue data are not sync with the X axis label.

How can I sync the chart line with the X axis label?

Thanks.

[img]https://i.imgur.com/sDOJrCH.png[/img]

[santossg]

Thanks to Indranil in this forum, I figured out what the problem is. I had used the label instead of x. It works now.

Again, thanks Indranil.

[Indranil]

@santossg,

Glad that you figured out

__________
Indranil Deo
Team CanvasJS