Matlab: How do I create a For Loop to calculate the number of positive and negative numbers in an array?

Hi,

I've generated a random whole number 1x20 array consisting of numbers between -40 and 40 with the following:

x = randi([-40 40], 1,20)

The next step is to use a for cycle to check every number in the array and calculate the number of positive and negative numbers, and then generate a new array 'd' in which every position of x that is positive will be a 1 and every negative a -1

Thanks

Answer 1

[Image Analyst]

Did you even try a for loop?

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Here's a start

count = 0;
for k = 1 : length(x)
    if x(k) >= 0
    else
    end
end

I'm sure you'll be able to figure out the rest.

[John Smith]

Hi, I've given it a stab and sorta got it to work like this:

for d=1:length(x)

if x(d) > 0

d = 1

elseif x(d) < 0

d = -1

end

end

What I need to do is put is make an array of 1s and -1s where the positive and negatives are, working on that at the minute but struggling, very new to mathcad