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DeprecationWarning: Substitution using function-call syntax and unnamed arguments

asked 2021-02-03 14:12:05 +0200

Adam_37_W gravatar image

Good morning,

I am trying to fix Deprecation Warning in my interact but I don't really know how to change the syntax to fix this warning. It says:

:16: DeprecationWarning: Substitution using function-call syntax and unnamed arguments is deprecated and will be removed from a future release of Sage; you can use named arguments instead, like EXPR(x=..., y=...) 
:22: DeprecationWarning: Substitution using function-call syntax and unnamed arguments is deprecated and will be removed from a future release of Sage; you can use named arguments instead, like EXPR(x=..., y=...) 
DeprecationWarning: Substitution using function-call syntax and unnamed arguments is deprecated and will be removed from a future release of Sage; you can use named arguments instead, like EXPR(x=..., y=...) 
  self._f(**dict([(k, self._last_vals[k]) for k in self._args]))

Could anyone help me?

The original is here:

@interact
def aproximace_delky_krivky(funkce = input_box(default = x*sin(x^2) + 7/2, type = SR),
dolni_mez_intervalu = input_box(default = 0, type = SR, label="dolní mez intervalu"),
horni_mez_intervalu = input_box(default = 4, type = SR, label="horní mez intervalu"),
pocet_deleni = slider(1, 100, 1, default=6, label="počet dělicích bodů")):

    a = dolni_mez_intervalu
    b = horni_mez_intervalu
    t = var('t')
    f = funkce
    dx = RR(b-a)/RR(pocet_deleni)

    xs = []
    ys = []
    for q in range(pocet_deleni):
        x = q*dx + dx + a
        xs.append(x)
    ys = [f(x) for x in xs]

    xz = []
    yz = []
    for q in range(pocet_deleni):
        t = q*dx + a
        xz.append(t)
    yz = [f(t) for t in xz]

    rects = Graphics()
    for q in range(pocet_deleni):
        x = xs[q]
        y = ys[q]
        g = xz[q]
        h = yz[q]
        rects += point((x, y), color="blue", pointsize=20)
        rects += point((a, f(a)), color="blue", pointsize=20)
        rects += line([(x, y), (g, h)], color="blue", thickness=2)

    show(plot(f, (x, a-0.5, b+0.5), color="red") + rects)

    priblizna_hodnota = sum([ sqrt((xz[q]-xs[q])^2 + (yz[q]-ys[q])^2) for q in range(pocet_deleni)])

    show(N(priblizna_hodnota))
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1 Answer

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answered 2021-02-03 15:48:33 +0200

Juanjo gravatar image

The problem comes from the fact that funkce is a symbolic expression and so it is f. Since f is not a symbolic callable function, you can not use the notation f(x). You have to replace x by the corresponding value, writing either f.subs(x=value) or f(x=value). So a simple solution is to replace

ys = [f(x) for x in xs]

and

yz = [f(t) for t in xz]

by

ys = [f(x=x) for x in xs]

and

yz = [f(x=t) for t in xz]

Hope this helps.

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Comments

Thank you so much. The problem is solved :)

Adam_37_W gravatar imageAdam_37_W ( 2021-02-03 19:02:41 +0200 )edit

@Adam_37_W - ideally, accept the answer by clicking the check mark at its top left. This marks the question as solved in the list of questions.

slelievre gravatar imageslelievre ( 2021-03-20 23:49:24 +0200 )edit

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Asked: 2021-02-03 14:12:05 +0200

Seen: 66 times

Last updated: Feb 03