Intro Homework help - what to change - where do i go from here?

heres the homework - i took a pic of it in the link http://tinypic.com/r/24cfo6b/7

i worked on the problem for about an hour last night and cant get the first grid right

heres what i did

x=0:.5:90;
y=.02:.05:.2;
[x,y]=meshgrid(x,y);
z = 300./sqrt(2.*pi.*y).*cos(x./2).*(1-sin(x./2).*sin(3.*x./2));
mesh(x,y,z)

[Wayne King]

You should post code where you are getting errors. People tend to help out more in those situations, than when somebody just asks for the solution to their homework.

[Jan]

I cannot see anything on tinypic. Itr is surely a fault of my restrictive security setting of my browser. I do not want to make my browser vulnarable only to see a picture.

It would be much more efficient, if the pictures can be hosted directly on the TMW servers.

Answer 1

[Walter Roberson]

sin() vs sind(). cos() vs cosd()

Answer 2

[William]

Just a quick reminder: Matlab does all that math in Radians. so if you want to convert it all use ether sind() or cosd() or multiply everything by 180/pi