Can Macro read line graphs?

[WH99]

Is there a way macro can read line graphs?
I have a graph with temperature along the bottom, weight along the left side
and in the the graph area there are several diagonal lines as pressure
altitude. By entering the graph at Temperature going straight up into the
graph to the correct pressure altitude then move left horizontally left and
that will give you the answer (weight).

 

[Jon Peltier]

Do you have formulas relating these numbers to each other? It would be
straightforward to solve these for the missing variable.

Trying to read values off a chart is not going to be easy. Tushar Mehta has
a kind of digitizing algorithm on his web site (http://tushar-mehta.com),
which I've never used, and I don't even know how he makes it work.

- Jon

 

[WH99]

Thanks Jon,
I see where your coming from!!!
I will try and figure out a formula for what I'm looking for.