1) For each fish, you want to find the mean of each row and store that number in a vector. You try this:
for i =1:length(rows)
m = mean(fish(i,:));
mean(i) = m;
end
You get this error:
In an assignment A(:) = B, the number of elements in A and B must be the same.
What's the easiest way to make this work?
a. Rename your vector so it doesn't conflict with the name of a built-in function
b. Try a while loop instead of a for loop
% My thought is that m = is a fine vector, because it isn't a built-in function, and neither is mean(i) = . I don't know enough about while loops to really answer this, we only just learned them today. I'm not sure how it would work if something needs to change in a while loop, since the data is constant, if that makes sense.
I tried working through it by creating my own data.
FishvsDays
Days 1 Days 2 Days 3
"Fish1" 4 3 6
"Fish2" 3 7 9
So Imported that as a column vector and a numeric matrix, because I wasn't sure exactly which to use, and ran the code...
Day1=[4;3]
Day2=[3;7]
Day3=[6;9]
%I tried Days=(Day1,Day2,Day3)
%but I get the error
Days=(Day1,Day2,Day3)
↑
Invalid expression. When calling a function or
indexing a variable, use parentheses.
Otherwise, check for mismatched delimiters.
%so I tried made Days=(FishVsDays).
for i =1:length(Days)
m = mean(Days(i,:));
mean(i) = m;
end
%but I get the error
Error using tabular/length (line 212)
Undefined function 'LENGTH' for input
arguments of type 'table'. Use the height,
width, or size functions instead.
%I'm not sure what's going on anymore. Any help is appreciated.
