Add data sets with xmgrace

Question

I use xmgrace to plot data sets and I would like to add two data sets together.

So I have two files:

data1

1 1
2 4
3 9
...

data2

1 2
2 3
3 4
...

I start xmgrace with

xmgrace data1 data2

Then I see both files plotted. Now I would like to generate a third graph which is just data1+data2 like

1 3
2 7
3 13
...

I know that this is extremely simple, but for some reason I don't understand how that works.

I played with the feature Data->Transformations->Evaluate expression... but I don't know what to select as "Source" and as "Destination".

PS: I know many other ways to reach my goal but I also want to be able to do it with xmgrace.

Answer 1

这可以使用该功能轻松实现 Evaluate expression...

xmgrace data1 data2

点击Data-> Transformations->Evaluate expression...

选择G0.S0两个集合（G0.S0和G0.S1）中的任何一个（比如）作为源。如果您希望输出到新集，请不要选择任何现有集作为目标。公式应为

y=g0.s0.y+g0.s1.y

该evaluateExpression窗口看起来应该像

当您 时Apply，G0.S3将创建一个新集合 ( )。您还可以修改公式（g1用于图形G1等）以在不同图形之间添加值。