Help with for loop

Question

Michael Jones 2017-3-10

回答： Image Analyst 2017-3-10

The problem is write a scripts file and use a for loop to determine the sum and number of all odd integers from 1 to 100 which is divisible by 3.

the answer should look like

sum of all odd integers divisible by 3 is :

number of all odd integers divisible by 3 is:

so far i have

x=1:2:100;
b=mod(x,3)
for b=0

but I am not sure where do go from there.

Answer 1

Star Strider 2017-3-10

You’re very close. If they’re divisible by 3, then the remainder after division by 3 will be 0.

This should get you started:

x=1:2:100;
b = x(mod(x,3) == 0);

The problem statement tells you to do this in a loop, then sum the values that meet the criterion. I leave that to you.

Answer 2

Image Analyst 2017-3-10

An alternate way:

theSum = 0;
for x = startValue : stepValue : stopValue
    theSum = theSum + ...?????.......
end

Can you figure out what startValue, stepValue, and stopValue are? Do you know what to add to theSum?