e^x/x

how can i plot e^x/x code

syms x;
f=exp(x)/x
t3=taylor(f, 'order',4) ;
xd=-pi:pi/20:pi;
yd=subs(f,x,xd);
td3=subs(t3,x,xd);
plot(xd,yd);

error
Error using symengine
Cannot compute a Taylor expansion of the input.

Error in sym/taylor (line 128)
tSym = mupadmex('symobj::taylor',f.s,x.s,a.s,options);

Error in exp1 (line 3)
t3=taylor(f, 'order',4) ;

Answer 1

[John BG]

function plot doesn't work with input type syms

Instead try the following

x=[-10:0.0001:10];
y=exp(x)./x;
plot(x,y);
axis([-10 10 -1e3 1e3])
grid on
title('e^x/x')

and the following doesn't crash

syms x x0;
  y= exp(x-x0)/(x-x0)
  x_tay4=taylor(y, 'order',4)
  y =
  exp(x - x0)/(x - x0)
  x_tay4 =
  (- exp(-x0)/(6*x0) - exp(-x0)/(2*x0^2) - exp(-x0)/x0^3 - exp(-x0)/x0^4)*x^3 + (- exp(-x0)/(2*x0) - exp(-x0)/x0^2 - exp(-x0)/x0^3)*x^2 + (- exp(-x0)/x0 - exp(-x0)/x0^2)*x - exp(-x0)/x0

if you find these lines useful would you please mark my answer as Accepted Answer?

To any other reader, if you find this answer of any help please click on the thumbs-up vote link,

thanks in advance for time and attention

John BG

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