changing my x increment along fplot

clear; clc; close all
syms x

y1 = 7*x^2 -8*x + 1;


Derivert_y1 = diff(y1);

figure(1)
fplot(x, Derivert_y1)
legend('y1 derivert')
xlabel('X-Verdier')
ylabel('Y-Verdier')
i want to change the increment from -5:1:5 to 0:0.002:2

Answer 1

[KSSV]

Why syms for this?

x = 0:0.002:2 ; 

y1 = 7*x.^2 -8*x + 1;
dy1 = 14*x-8 ; 

plot(x,dy1)

Answer 2

[Ameer Hamza]

Pass interval as 3rd argument of fplot():

fplot(x, Derivert_y1, [0 2])