Running through a randomly generated array and doing calculations

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Ian
Ian 2014-2-4
编辑： Mischa Kim 2014-2-4
Here's the problem statement: "Consider an array x of randomly generated positive and negative integers. Write a script that performs the following iteration: starting with 0 it goes through the entries of x, adds them to the total if they are positive and multiplies them by the total if they are negative."
The array x has been provided. It's a 1x20 matrix named HW1Rand
Here's the code I've got so far:
HW1_6a = 0; %initialization
for ii = HW1Rand(1,1:20)
if ii>0
HW_6a == HW_6a + ii
else
HW_6a == HW_6a * ii
end
end
However I keep getting an error. Please help!

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Mischa Kim
Mischa Kim 2014-2-4
编辑：Mischa Kim 2014-2-4
Ian, what is HW1Rand(1,1:20), in other words, how is the function/matrix defined? Also, for assignments in MATLAB you'd use a simple =. The == is a relational operator.
Finally, you are initializing HW1_6a but use HW_6a in the calculations.
HW_6a = 0; % initialization
for ii = HW1Rand(1,1:20) % assuming HW1Rand is properly defined
if ii>0
HW_6a = HW_6a + ii
else
HW_6a = HW_6a * ii
end
end

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