After I switched to using arrows = curve in the call to DEtools:DEplot I found errors in some calls.
Is there a workaround other than not using this option? As phase plot looks like better with this option. For now, I will remove this option.
Here is an example
restart;
ode:=diff(y(x),x)1/(x^2+1)^(1/2) = 0;
x_range:=0.99 .. 0.99;
DEtools:DEplot(ode,y(x),x =x_range,y = 1.6 .. 1.6,[y(0) = 0],arrows = 'curve')
Error, (in DEtools/DEplot/direction) cannot assign a complex value to a hardware float Array
But this works
restart;
ode:=diff(y(x),x)1/(x^2+1)^(1/2) = 0;
x_range:=0.99 .. 0.99;
DEtools:DEplot(ode,y(x),x =x_range,y = 1.6 .. 1.6,[y(0) = 0])
I will report this to Maplesoft as it looks like a bug to me.
May be someone can find a workaround so I can use arrows = curve?
Maple 2023.2 on windows 10
> 
ode:=diff(y(x),x)1/(x^2+1)^(1/2) = 0;
x_range:=0.99 .. 0.99;
DEtools:DEplot(ode,y(x),x =x_range,y = 1.6 .. 1.6,[y(0) = 0],arrows = 'curve')

Error, (in DEtools/DEplot/direction) cannot assign a complex value to a hardware float Array
> 
ode:=diff(y(x),x)1/(x^2+1)^(1/2) = 0;
x_range:=0.99 .. 0.99;
DEtools:DEplot(ode,y(x),x =x_range,y = 1.6 .. 1.6,[y(0) = 0])


Download detools_deplot_arrows_curve_problem_NOV_10_2023.mw