Hello everyone,
I am still learning a lot about Mathematica. I am trying to understand how I can use mathematica to grab list elements, set them equal to variables and then use the variables in as the bounds for integration. But, as you can see in the code below, the list length is also a variable. So when i'm trying do 30 list elements instead of 40 I would get {NULL} as the out. So I created an IF clause to try and just assign that to zero. Obviously an integral bounded between zeros is zero. This allows the element to still be assigned to the integral but would be excluded from the calculation. How can I create a list of variable length and always have the right number of h_ statements to extract the list elements?
in:
sections = 40;
height = 10;
h = Range[0, sections - 1]*height
Out:
{0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, \
160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, \
300, 310, 320, 330, 340, 350, 360, 370, 380, 390}
In:
h1 = Part[h, 1];
If[h1 == Null, h1, 0, h1]
Out:
0
Same for h2-h39
In:
h40 = Part[h, 40];
If[h40==Null, h40, 0, h40]
Out:
Element 40 DNE
