How do I change the increment in a loop
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I have been asked to write a function that calculates the sum of the series;
2^(5*i-1)
where i = 1,3,5... I currently have
function s = summation(N)
% Syntax
% s = summation (N)
% Input
% N = Number of terms in series
%Output
% sum of series
%Initilising loop to be zero
s = 0;
for i = 1:N
% loop adds previous value of s to the next one
s = s + 2^(5*i-1);
end
% increasing increment i by 2 from 1 [1,3,5...etc]
i = i+2;
end
which calculates the sum for i=1,2,3.... How do I change the increment of i?
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回答 (2 件)
Stephen23
2017 年 5 月 9 日
編集済み: Stephen23
2017 年 5 月 9 日
i = 1:2:N
^ define the step size here!
The colon operator is clearly explained in the documentation:
2 件のコメント
Jan
2017 年 5 月 9 日
Note: Whenever you have questions concerning a specific command, read the documentation at first. Matlab's docs are the best I've ever read. They are useful and clear, and the "See also:" lines are smart guesses of what the user might be interested also in, when the command does not perfectly solve the problem.
Noman Rathore
2018 年 12 月 5 日
Hello i am New researcher , and new to Matlab programming , but i understand the basius of programming , my querry is how i can use help and support for guidance for programming my own program. i most of the time do not find the useful help.
Nomi
Phirime Monyeki
2020 年 2 月 10 日
N = 100 ; % should be multiple of the number of parts you want
th = linspace(0,2*pi) ;
y = cos(th) ;
plot(th,y)
% divide the section into 5 equal parts
th1 = reshape(th,5,[]) ;
y1 = reshape(y,5,[])
3 件のコメント
Steven Lord
2023 年 3 月 12 日
For the original question looking at the documentation for the colon function (which is the function name for the : operator) is correct. That's the tool you use to create a vector if you know the two desired endpoints and the increment.
For the answer under which these comments lie, you'd want to look at the documentation for the linspace function. That's the tool you use to create a vector if you know the two endpoints and how many elements you want the vector to have.
If you know one of the endpoints, the increment, and the number of elements you want the vector to have you can do that with colon as well.
startPoint = 1;
increment = 1;
numPoints = 10;
x = startPoint + increment*(0:numPoints-1)
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