I previously posted a version of this question, but did not get any response. So I decided to rephrase and try again.
I have been trying to compare the solvers (BDF, Radua, Stiffr and Stiffb) for stiff odes. Could be doing something stupid but BDF is the only one that I can get to run consistently. For the others I get error messages I do not understand (in this context):
"The return value of this function must match the problem size"
"This value must be real"
(BTW. Documentation says Stiffb does not work for more than 8 equations, but it seems like it should be "8 or more". 7 worked. 8 did not.)
Thanks to anyone who chimes in.
If you run the worksheet, be patient. It takes a while to calculate.