A for loop that finds multiples of certain numbers in a given range

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Caroline F
Caroline F 2022-3-7
评论： Image Analyst 2022-3-14
I am trying to create a for loop that finds all values in the range [1,100] that are also multiple of 3 or 5 and save these in a row vector labeled M1. It was suggested that I use mod()/rem() functions. I have been able to do this without a for loop, but when I try to use the for loop the answer is not in row vector form and there are a lot of blank answers.
x = [1:100];
i=1;
for k = 1:length(x)
i=k(mod(k,3)==0)
i=k(mod(k,5)==0)
end
M1=i

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采纳的回答

David Hill
David Hill 2022-3-7
编辑：Image Analyst 2022-3-14
Ran in:
y=[];
for k = 1:100
if mod(k,3)==0||mod(k,5)==5
y=[y,k];
end
end
y
y = 1×33
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78 81 84 87 90

更多回答（1 个）

Image Analyst
Image Analyst 2022-3-14
Ran in:
Try this:
% Construct a list of values to check. Call it x.
x = 1 : 100;
% Initialize our output row vector to null. Then we'll fill it up.
M1=[];
% Now check all the values in x to see if they are a multiple of 3 or 5.
for k = 1 : length(x)
% Get this value of x.
this_x = x(k);
% Check the value to see if it's a multiple of 3 or 5.
if (mod(this_x, 3) == 0) || (mod(this_x, 5) == 0)
% If we get here, this_x is a multiple of 3 or 5.
% Store the value in our output vector.
M1 = [M1, this_x];
end
end
M1
M1 = 1×47
3 5 6 9 10 12 15 18 20 21 24 25 27 30 33 35 36 39 40 42 45 48 50 51 54 55 57 60 63 65

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