Hi experts, please give me a solution, i want to comparison of the approximate error to find the root of the function (x+2)^3+1 with two methods such as secant method and bisection method in matlab code. I am new in matlab coding. Need help

My two code is like if i get error data(y1,y2) of two method & iteration data(x), but i can't work. It shows same error in two code like vectors must be same lengths in 5th line(1st code)& in 3th line(second code) .

x= 0:2:14
y1=[6 2 5 6 7 8 9 ];
y2=[2 3 4 5 7 8 9 ];
figure;
plot(x,y1)
hold on
plot(x,y2)
hold off

Second code is

x = linspace(0,20)
y =[6 2 5 6 7 8 9 ];
plot(x,y)
xlabel('x-axis')
ylabel('y-axis')
y= [2 3 4 5 7 8 9 ]
z= [6 2 5 6 7 8 9 ]
plot(x,z,x,y)
grid on
axis auto
legend('squared','cubic')

[Geoff Hayes]

Mir - in your first set of code

x= 0:2:14
y1=[6 2 5 6 7 8 9 ];

x has 8 elements and y1 has seven. In the second set of code,

x = linspace(0,20)
y =[6 2 5 6 7 8 9 ];

x has 100 elements and y has seven. In either case, the error message makes sense since you need to have the same number of elements in each array passed to plot. How are you choosing your y1 arrays given the x arrays?

[Mir Md. Moheuddin Khan]

i take it randomly. what is solution, now?

[Geoff Hayes]

The solution is to ensure that the arrays have the same number of elements.

x= 0:2:14
y1=[6 2 5 6 7 8 9 12];

and

x = linspace(0,20,7)
y =[6 2 5 6 7 8 9 ];