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Write a function called freezing that takes a vector of numbers that correspond to daily low temperatures in Fahrenheit. Return numfreeze, the number of days with sub freezing temperatures (that is, lower than 32 F) without using loops. Here is an ex

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Hello there, I am very new to Matlab and I am having trouble with this question. I understand how to make the function work for the given matrix in the problem. However, I cannot find out how to make it work for random temperature vectors. Would anyone mind giving me a hint or helping me out? Would be greatly appreciated. Thank you.
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Accepted Answer

Stephan
Stephan on 12 Jul 2019
function numfreeze = freezing (n)
n1 = n(n<32)
numfreeze = numel(n1)
end
Dont overwrite n - it is an input argument
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More Answers (5)

Vineet Singhal
Vineet Singhal on 14 Oct 2019
function numfreeze = freezing(v)
a= length(v(v<32));
numfreeze =a;
end



Rajeev Mehndiratta
Rajeev Mehndiratta on 28 Oct 2020
function numfreeze = freezing(V)
A=0
V
V(V<32) = A
A =logical(V)
B=sum(A)
numfreeze=B
end
  1 Comment
Rik
Rik on 28 Oct 2020
You're correct, this solution didn't exist in this thread yet, although I would clean it up to this:
function numfreeze = freezing(V)
V(V<32) = 0;
V = logical(V);
numfreeze = sum(V);
end

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Nadeem U Rehman
Nadeem U Rehman on 10 Dec 2020
function numfreeze = freezing(A)
F = A(A<32);
[row column] = size(A);
if size(A) == [1 column]
numfreeze = size(F,2);
else
numfreeze = size(F,1);
end
end
  4 Comments
Rik
Rik on 10 Dec 2020
These homework solutions are probably not the best place to get feedback. After completing the Onramp tutorial (which is provided for free by Mathworks), I would suggest looking at this thread.
And where you went wrong is in assuming what == does, instead of reading the documentation. There is an important difference between equals (which is called when you write ==) and isequal. size(A)==[row column] will result in a two-element logical vector if A is a vector or 2D array (and an error if A has more dimensions).
% Let's take a look at what if does:
A=[]; if A, disp(A),end
A=true; if A, disp(A),end
1
A=[true false]; if A, disp(A),end
A=[true true]; if A, disp(A),end
1 1
A=[false true]; if A, disp(A),end
A=[false false];if A, disp(A),end
Did you expect these results? What does this say about how your code would work?

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