Solving with multiple unknown variables & more

[Han]

(03-30-2015 01:13 PM)leprechaun Wrote:  I don't understand how to plot Ekin(m,v). I do assign m:=70, so that is no longer a variable.
Why does F1:=Ekin not work in that case. How can I assign Ekin to the app?

Even though you defined m:=70, that does not affect dummy variables. That is, if Ekin(m,v) is defined with m and v as dummy variables, then these are just "placeholders" and only take on numerical values when evaluating the function Ekin.

As I explained earlier, F1:=Ekin does not work because F1 is a one-variable function whereas Ekin is a two-variable function. You can do something like:

g(x):=Ekin(70,x);
F1:=g; // (automatically adjusts the placeholder variable x to X)

In the Function app, just type in Ekin(70,X) -- note the upper case X.