need to compile outputs from for loop into array

startYear = input('Pick a year to start the Array from. \n');
endYear = input('Pick a year to end the Array at. \n');
ctr=1;
yeararray = startYear:endYear;
outputarray = []
for n = yeararray
    if IsLeapYear(n) == "True"
        outputarray(ctr) = outputarray(ctr) + n;
        ctr = ctr + 1;
    end
end
disp(outputarray)

A couple pieces of code are missing from this but i think you can understand the process, im trying to grab Leap Years in between 2 points and compile them into and Array but are struggling to do so. I tried to compile them into an array using numel():

outputarray = zeros(1, numel(yeararray))

however this makes the array way too big for the amount of values it outputs and just provides me with a bunch of zeros that are filler. Any tips?

Answer 1

[Torsten]

In most cases,

outputarray = zeros(1,nnz(mod(yeararray,4)==0))

will work.

[Lewis]

You're a legend mate, thanks a lot

[Lewis]

so this doesnt work for higher ranges, any other tips for that?

i did 1:1000 and it had 0's past 996

[Torsten]

I wrote in most cases. The exact rule is

outputarray = zeros(1,nnz( (mod(yeararray,4) == 0 & mod(yeararray,100) ~= 0) | (mod(yeararray,400) == 0)))

Since you now know the number of leapyears within the yeararray, you can substitute your complete code by a one-liner.