For loop fibonacci sequence

I need to create a Fibonacci sequence using the for loop function. the first two number of the Fibonacci sequence must be defined from a user input.

I then need to plot this on a polar graph with the element number as the angle and value of the element in the sequence for the radius

[Steven Lord]

This sounds like a homework assignment. If it is, show what you've written to try to solve the problem and ask a question about the specific issue that's blocking you from moving forward and we may be able to offer some guidance.

[dominic blackler]

this is what I have created so far. I just don't quite get the desired results for the for loop function

clear, clc
x = 'Input first term of the Fibonacci sequence: ';
input_first_term = input(x);
y = 'Input second term of the Fibonacci sequence: ';
input_second_term = input(y);
s=zeros(1,10)
s(1)=input_first_term;
s(2)=input_second_term;
for i=3:10
    s(i)=s(i-2)+(i-1);
end
disp(s)

[Muhammed Roshdy]

% Fibonacci sequence

clear;clc;

sequence_end=25; %Insert the Sequence end here

F_curr=zeros(1,sequence_end);

golden_ratio=zeros(1,sequence_end-1);

F_curr(1) = 0; %Insert First Value of the sequence here

F_curr(2) = 1; %Insert second Value of the sequence here

i=3;

golden_ratio(1)=F_curr(2)/F_curr(1);

for n=3:sequence_end

F_curr(i)=F_curr(i-1)+ F_curr(i-2);

golden_ratio(i-1)=F_curr(i)./F_curr(i-1);

i=i+1;

end

disp(F_curr)

disp(golden_ratio(end))

Answer 1

[Ameer Hamza]

In the code you shared, you made a mistake in the line inside for loop. Despite that, your logic is correct. Correct it as follow,

s(i)=s(i-2)+s(i-1); % you missed second s

[dominic blackler]

thanks I have amended the script. My next problem is I then need to plot this on a polar graph with the element number as the angle and value of the element in the sequence for the radius.

I have inputted this script now but it just doesn't seem right from the graph.

clear, clc
x = 'Input first term of the Fibonacci sequence: ';
input_first_term = input(x);
y = 'Input second term of the Fibonacci sequence: ';
input_second_term = input(y);
s(1)=input_first_term;
s(2)=input_second_term;
for i=3:10
    s(i)=s(i-2)+s(i-1);
end
disp(s)
d=(1:10);
polarplot(s,d)
title('Fibonacci sequence 6.6')

[James Tursa]

@dominic: You don't need to keep adding blank lines in your code to format it. Simply select the code and then push the "{ } Code" button.

[John D'Errico]

@dominic: READ THE HELP FOR POLAR PLOT! Before you use any function, read the help. Make sure you understand what the arguments are intended to mean.

polarplot(TH,R) plots vector TH vs R. The values in TH
  are in radians.

Really, you were so close.

You were asked to plot: "with the element number as the angle and value of the element in the sequence for the radius"

What did you do?

polarplot(s,d)

You passed in the arguments in the wrong order.

You were told to use the element number as the angle (in radians). So do this:

polarplot(d,s)

So close, yet so far. :)

[dominic blackler]

thanks you

Answer 2

[Tasbiha Azeemi]

Try this one!!!

function a=FabonacciSequence(n)

a(1)=0;

a(2)=1;

for i=1:n;

a(i+2)=a(i+1)+a(i)

end

end

[Milan Parikh]

It is not correct method

Answer 3

[Nwajiobi Chibueze]

x = input('enter the first and second number of the sequence:')

y = input('enter the number of elements in the sequence:')

for k = 3:y

n(1) = x;

n(2) = x;

n(k) = n(k-1)+n(k-2);

end

n

polar(n)