histogram for every loop

Question

SINDU GOKULAPATI 2021-5-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/831208-histogram-for-every-loop

回答： Hrishikesh Borate 2021-5-28

rnorm.csv

i have set of normalised points [x,y,z] (rnorm)[ i have attached 50 values as a csv file below] , i need histogram of each point wrt the angle it has from other points

angle = transpose(rnorm{i})*rnorm{j}; //used this for angle

if angle > cosd(20) && angle < cosd(0) // for angle condition

how do i get histogram withrespect to each point ?

ur help is appretiated thanks

ps: for i=1:n

for j=1:n

angle = transpose(rnorm{i})*rnorm{j};

if angle > cosd(20) && angle < cosd(0)

im struck here (im not finding a way to store the angles accumulated )(basically to get histogram for every loop of 'i')

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Answer 1

Hrishikesh Borate 2021-5-28

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Hi,

It’s my understanding that you are attempting to store all the angles satisfying the condition for every iteration. Following is the code for the same:-

rnorm = readmatrix('rnorm.csv');
% The allAngle array is used to store all the angles satisfying the condition.
allAngle = [];
for i=1:size(rnorm,1)
    angle = sum(repmat(rnorm(i,:),size(rnorm,1),1).*rnorm,2);
    idx = angle > cosd(20) & angle < cosd(0);
    angle = angle(idx);
    allAngle = [allAngle;angle];
    % Perform computation on the angle array from here.
end