How to find a decimal point value and to stop at the first value

Hi there,

I am trying to make a script where I can define a variable as the number of vectors required to capture at least 99.9% of the variance.

I am trying to get the first output in 'test' that is 99.9 assigned to a variable. Also, the while loop isn't working as I intended, as the size(test) outputs 60 1. My intention for the while loop was to scan through test and stop once the limit (99.9) was found. My intention is If I could size(test), I could use a find feature to find the first 99.9 value.

Any help is appreciated.

Below is my script:

[eigvects,~,eigvals] = pca(D);
cumulative_percent_variance_permode = 100*eigvals/sum(eigvals);
test = cumsum(cumulative_percent_variance_permode)
limit = 99.9
while test < limit 
    i = 1:length(test);
    if i(test) == limit  
    break
    end
end

size(test)

Answer 1

[Walter Roberson]

[eigvects,~,eigvals] = pca(D);
cumulative_percent_variance_permode = 100*eigvals/sum(eigvals);
test = cumsum(cumulative_percent_variance_permode);

i = find(test >= limit, 1, 'first');

[Martyn Blairs]

Of course, thank you so much for replying.