I have functions using define_external to call a .dll  In uploaded file "dll_test.mw" I'm showing one such function.  Immediately after defining the function I call it and it works.  There are a lot more similarly defined functions and once defined in the worksheet they are working as hoped. 

My question is can I make the functions avaliable across multiple worksheets somehow?  google ai suggested using "read" but in uploaded file "read and load test.mw" you can see that it's not working for me.  using read I get an error I don't understand and using load doesn't return an error but it also doesn't result in an executable KinAddCurveData function.

Any help would be very appreciated.

Download dll_test.mw

Download read_and_load_test.mw

Download dsolve_problem.mw

I'm using Maple 2022.  I'm using fsolve to solve for values of 3 variables and I've created a function that looks like 

solution := (TtT, FtT) -> fsolve({eq1, eq2, eq3},{Y,P,PY},{Y=0..100,P=0..100,PY=0..100})

this works fine, giving answers like

solution(1, 0.5);
    {P = 0.1813175442, PY = 0.1593412279, Y = 0.4393982627}

I'd like to plot Y vs TtT at a fixed FtT of 0.5 so I defined a second function

YFtpt5 := TtT -> solution(TtT, 0.5)[3]

this also works fine, giving

YFtpt5(10);
                       Y = 0.02320766980

so I try to plot it with a range variable like this

with plots:

plot(YFtpt5,0.01..10)

but this gives the error 

plot(YFtpt5, 0.01 .. 10);
Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct

It draws axis but no plot.  I've evaluated the function at 0.01,10, and a number of points in between and everything I've tried gives a numeric answer.  Is it because the answer is "Y=0.43"  or something else.