Hello,

If my expression in Calculator or Python Calculator filter returns a single value (i.e. averaging a variable over the entire domain), how can I see that single value (without plotting or exporting the data)?

# How to get a single value result from the calculator?

**hconel**#1

**Kenneth_Moreland**(Kenneth Moreland) #2

The `Calculator`

filter does not have the ability to do reduction operations like average, so the point is moot there. The `Python Calculator`

can do operations like `mean`

, `sum`

, and `min`

/`max`

, but the result is going to replicated on every point or cell in the domain.

The easiest way to see the result is to go to the `Information`

tab behind the `Properties`

panel and look at the information in the `Data Arrays`

. It will give the range of the values calculated, which of course will be a single value.

For more detailed information about the data in a dataset, you can open the SpreadSheet view. Click the `Split Vertical`

button over the view and then create a `SpreadSheet`

view.

**hconel**#3

Thanks for the reply Mr. Moreland. My ultimate goal is to plot (or export) the sum of a variable in the entire domain versus time. Can you suggest a practical way of doing this?

**Kenneth_Moreland**(Kenneth Moreland) #4

This is not exactly what you asked for, but it is very easy to plot the average of a variable (along with the min, max, and quartiles) by applying the `Plot Data Over Time`

filter. (You need the most recent ParaView 5.6 for this to be available.)

If you really need to plot the *sum* over time, probably the easiest way to do that is to compute the sum with the `Python Calculator`

as previously described, then selecting a single point (or cell) and then apply the `Plot Selection Over Time`

filter.