I can give you a couple of pieces ... perhaps enough that you can figure the rest.
PROC PLOT is expecting to see variable names, not equations. So your DATA step has to calculate all the variables, and all the points of interest. Something like this:
Data VonBert;
Input Linf k t0;
do time=1 to 20;
Lt= some formula goes here;
output;
end;
datalines;
900 0.15 -0.99
;
Then plot what I think would be Lt on the Y axis and Time on the x axis:
proc plot data=vonbert;
plot Lt * time;
run;
This may not be the entire answer, but it's a step forward.
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