MIT6_094IAP10_lec02

Colbie

MIT6_094IAP10_lec02
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* g5 q+ U& a5 l; c7 K• How long did it take to do required problems?
• Did anyone do optional problems?
! C" a# ~$ X0 `  W$ W• Was level of guidance appropriate?
8 _( f) T4 X# }$ ]$ q6 C, a• Unanswered Questions?
• Some things that came up:
4 p9 i& K3 X  n; @+ k  y$ y- p• Use of semicolon – never required if one command per line.
7 U! ^3 ~- d# {# j  I, G5 \You can also put multiple commands on one line; in this case a semicolon is necessary to separate commands:
» x=1:10; y=(x-5).^2; plot(x,y);
• Assignment using indices – remember that you can index into matrices to either look up values or to assign value:
+ g: z$ ^- V& X  j» x=rand(50,1); inds=find(x<0.1); y=x(inds);
x(inds)=-x(inds); x(inds)=3;
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