creating an array from a single user input

how would i create and array from an input:

eg user inputs the number 12

array is made: 1,2,3,4,5,6,7,8,9,10,11,12

[Stephen23]

https://www.mathworks.com/help/matlab/ref/colon.html

[Jakub]

clc

%user input

userinput = input('input nth value for fibonacci calculation:');

%must define two empty matrices one for fibonacci values and one for ratios

fibonacci = [];

ratio = [];

%define first two fibonacci values

fibonacci(1) = 0;

fibonacci(2) = 1;

%define first golden ratio to be infinity

ratio(1) = 1/0;

%make a loop for the fibonacci equation starting from 3

for i = 3:(userinput+1)

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

end

%make a loop for golden ratio values and equation

for i=2:12

ratio(i) = fibonacci(i)/fibonacci(i-1);

end

%create an array

n = 1:13;

%display final product

table1=table(n,ratio,fibonacci);

table2struct(table1)

%im trying to tabulate the golden ratio, fibonacci and nth amount which is the user input however im having major problems with the n

[Dyuman Joshi]

Why is it "must" to define empty matrices?

%Random value
userinput = 12;%input('input nth value for fibonacci calculation:');

%define first two fibonacci values
fibonacci = [0 1];
%define first golden ratio to be infinity
ratio = 1/0;


%make a loop for the fibonacci equation starting from 3
for i = 3:(userinput+1)
    fibonacci(i)=fibonacci(i-1)+fibonacci(i-2);
end

Why only till 12? And you can also club the two for loops together.

%make a loop for golden ratio values and equation
for i=2:12
    ratio(i) = fibonacci(i)/fibonacci(i-1);
end
%create an array
n = 1:13;
%display final product
table1=table(n,ratio,fibonacci)

table1 = 1×3 table
         n            ratio        fibonacci 
    ___________    ___________    ___________

    1×13 double    1×12 double    1×13 double

table2struct(table1)

ans = struct with fields:
            n: [1 2 3 4 5 6 7 8 9 10 11 12 13]
        ratio: [Inf Inf 1 2 1.5000 1.6667 1.6000 1.6250 1.6154 1.6190 1.6176 1.6182]
    fibonacci: [0 1 1 2 3 5 8 13 21 34 55 89 144]

The code is working fine.

"however im having major problems with the n"

What is the problem that you are facing?

[Jakub]

clc

%user input

userinput = input('input nth value for fibonacci calculation:');

%define two empty matrices one for fibonacci values and one for ratios

fibonacci = [];

ratio = [];

%define first two fibonacci values

fibonacci(1) = 0;

fibonacci(2) = 1;

fibonacci(3) = 1;

%define first golden ratio to be infinity

ratio(1) = 1/0;

%make a loop for the fibonacci equation starting from 3

for i = 3:(userinput+1)

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

end

%make a loop for golden ratio values and equation

for i=2:userinput

ratio(i) = fibonacci(i)/fibonacci(i-1);

end

%create an array

n = 1:13;

%display final product

table1=table(n,ratio,fibonacci);

table2struct(table1)

disp(table(userinput,fibonacci,ratio))

so this is the fixed script, ive changed for i = 2:userinput so now whatever is inputted then that is what the ratio will go up to, will lump the for loops together. however what id like is for the n to be an array dependant on whatever has been input so if i input 25 then the ratio goes from 1-25 and so does fibonacci however n stays at 13.

However id like the n value to display 1,2,3,4,5,6,7,8...until user input has been reached.

Answer 1

[David Hill]

userinput = input('input nth value for fibonacci calculation:');
%define two empty matrices one for fibonacci values and one for ratios
fibonacci = [];
ratio = [];
%define first two fibonacci values
fibonacci(1) = 0;
fibonacci(2) = 1;
fibonacci(3) = 1;
%define first golden ratio to be infinity
ratio(1) = 1/0;
%make a loop for the fibonacci equation starting from 3
for i = 3:(userinput+1)
    fibonacci(i)=fibonacci(i-1)+fibonacci(i-2);
end
%make a loop for golden ratio values and equation
for i=2:userinput
    ratio(i) = fibonacci(i)/fibonacci(i-1);
end
%create an array


n = 1:userinput;%NEED n TO BE 1:userinput




%display final product
table1=table(n,ratio,fibonacci);
table2struct(table1)
disp(table(userinput,fibonacci,ratio))