When working with the command implicitplot, I have ran into, what seems to be, a display problem.

The function is:

FUNCTION:=.2000000000*KD*(.4000000084e11*KD^4+.2000646828e11*A^3*KD+2599526811.*A^4+.8000000310e11*A*KD^3+.6000015850e11*A^2*KD^2)/(8000428951.*A^2*KD^3+4026396656.*A^3*KD^2+1812351958.*A^4*KD+8000003596.*A*KD^4+3200000068.*KD^5+.1010000000e11*A^5)

I define:

KD :=10^logKD; (so as to plot the function with a logaithmic x-axis)

and the implicitplot command is:

implicitplot(FUNCTION = 1.25, logKD=0..3, A=.1..950, grid = [100,100]);

The generated plot is:

The problem persists as long as the range is of 3 log units or larger, regardless of the particular ends of the range. For example:

However, I noticed that, if I decrease the range to, say, only 2 log units, the plot starts looking better.

If I increase the range to, say, 4 log units, however, the plot looks even worse:

IWhat is going on? This looks like a display problem.

Any insight will be very much appreciated.

@acer , I am trying the implicitplot command, and it is working perfectly well.

Thank you very much for calling my attention to this command!

Thank you very much for your prompt answer! I will try your suggestion!

Thank you very much for your prompt reply!

Yes, I use Maple 6 from the year 2000, and it works great for my purposes, at least thus far. I have never used the plots: implicit command, so I will give it a try.

My function is a fifth-order polinomyal (a*x^5 + b*x^4 + c*x^3 + d*x^2 + e*x + g = 0). I want to plot x for a range of values of a given fixed values of b, c, d, e, and g. I expect only one real-number solution x per a value. When I use fsolve and do this one a-value at a time (fsolve (f = 0, {x});),  I always get a single value of x.