How can I show gaps in a line graph?

[Paul D]

Hello,

  I have a data set which represents sensor readings. Each reading is a time stamp and a numeric value.

Sometimes there are gaps in the data and I want to display those gaps in the data.

What I am doing right now is parsing my data and detecting the gaps based on my own algorithm.

What I am struggling to do now is draw each data set as a separate line on the same graph.

I have tried creating a DataTable for each data set and then drawing each one onto the same DIV in the page but only the last drawn graph is shown.

Can anyone give me some suggestions on how I might achieve this?

To be clear, if there is a gap in the data (a gap is defined as a difference of greater than 60 seconds) I want the line graph to be broken to visually represent the break in the data stream.

thanks.

[Daniel LaLiberte]

If you use null values in your data, and set the interpolateNulls option to false (the default), then the line will be broken at the points where there are nulls.

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Daniel LaLiberte

dlaliberte@Google.com   5CC, Cambridge MA

[Paul D]

Thanks Daniel, I have got my code working that way now and it looks good.

Paul

On Saturday, August 26, 2017 at 4:18:51 PM UTC+1, Daniel LaLiberte wrote:

If you use null values in your data, and set the interpolateNulls option to false (the default), then the line will be broken at the points where there are nulls.

On Sat, Aug 26, 2017 at 5:50 AM, Paul D <pa...@p3d.co.uk> wrote:

Hello,

  I have a data set which represents sensor readings. Each reading is a time stamp and a numeric value.

Sometimes there are gaps in the data and I want to display those gaps in the data.

What I am doing right now is parsing my data and detecting the gaps based on my own algorithm.

What I am struggling to do now is draw each data set as a separate line on the same graph.

I have tried creating a DataTable for each data set and then drawing each one onto the same DIV in the page but only the last drawn graph is shown.

Can anyone give me some suggestions on how I might achieve this?

To be clear, if there is a gap in the data (a gap is defined as a difference of greater than 60 seconds) I want the line graph to be broken to visually represent the break in the data stream.

thanks.

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Daniel LaLiberte

dlali...@Google.com   5CC, Cambridge MA