matlab series using for

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Michelle
Michelle 2021-6-20
评论： Image Analyst 2021-6-25
I want to code series f = [ f(1); f(2); f(3); f(4) ] using 'for'
V = [ 1;1;1;1;1] d = [0;0;0;0;0]
Y = [ 49.86 0 0 0 49.86;
0 28.585 0 9.9597 19.919;
0 0 99.72 99.72 0;
0 0 99.72 148.44 39.839;
49.86 19.919 0 39.839 108.96]
theta = [ -85.711 0 0 0 94.289
0 -84.624 0 95.143 95.143
0 0 -85.711 94.289 0
0 0 94.289 -85.393 95.143
94.289 95.143 0 95.143 -85.217]
f(k) =
This is my code but it doesn't works as a series
f = zeros(4,1);
for k = 1:4
sum = 0;
for n = 1:5
sum = sum + V(k)*Y(k,n)*V(n)*cos(deg2rad(d(k)-d(n)-theta(k,n)))
end
f(k) = sum
end

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回答（1 个）

Image Analyst
Image Analyst 2021-6-20
编辑：Image Analyst 2021-6-20
You did not ask any questions. You just made an announcement. I assume you'd like to ask for advice.
Tips:
  1. Don't use sum as the name of your variable since it's a built-in function.
  2. Instead of cos(deg2rad(angleInDegrees)), use cosd(angleInDegrees). cosd() is a special function where you can input degrees directly so you don't need to convert the variable to radians explicitly.
  3. What's the point of your d being all zeros?
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Mathieu NOE
Mathieu NOE 2021-6-25
hello
on my side I didn't find an obvious bug in your code
why do you say the summation does not work ?
Image Analyst
Image Analyst 2021-6-25
@Michelle,
This works fine:
clc; % Clear the command window.
fprintf('Beginning to run %s.m ...\n', mfilename);
close all; % Close all figures (except those of imtool.)
clearvars;
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 13;
V = [1;1;1;1;1]
d = [0;0;0;0;0]
Y = [49.86 0 0 0 49.86;
0 28.585 0 9.9597 19.919;
0 0 99.72 99.72 0;
0 0 99.72 148.44 39.839;
49.86 19.919 0 39.839 108.96]
% Declare theta in degrees.
theta = [-85.711 0 0 0 94.289
0 -84.624 0 95.143 95.143
0 0 -85.711 94.289 0
0 0 94.289 -85.393 95.143
94.289 95.143 0 95.143 -85.217]
f = zeros(4,1);
for k = 1:4
theSum = 0;
for n = 1:5
angle = d(k) - d(n) - theta(k, n); % In degrees, so we can use cosd()
theSum = theSum + Y(k,n) * V(n) * cosd(angle);
end
f(k) = V(k) * theSum;
end
f
fprintf('Done running %s.m\n', mfilename);
Do you have any problem with it?

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