Thanks. You saved me a lot of time. On Saturday, December 21, 2019 at 11:57:49 AM UTC-7, Nils Bruin wrote: > > The problem is fairly subtle, but it boils down to the fact that input_box > wants a *string* as default value , because a string is also what it gets > from the user. Note that your names x and y are bound to x(t) and y(t) > respectively. Input box turns its default parameter to a string, so the > expression 3*x-2*y turns into the string "3*x(t)-2*y(t)". > > Later when this is evaluated, it is evaluated in the context of the global > bindings that are currently in force in your sage session, so with x,y > being bound to x(t) and y(t) this turns into evaluating > > 3*x(t)(t)-2*y(t)(t) > > for which the deprecation warning is entirely correct. > > The solution is to quote your arguments to input_box as strings, i.e., > > ... input_box(default = "3*x - 2*y") ... > >
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