can you write a vector function?

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Thomas Starai
Thomas Starai 2019-6-23
评论： Star Strider 2020-1-6
I am looking to express a parametrized vector function and draw the surface..
  2 个评论
Adam Danz
Adam Danz 2019-6-23
How can we help you with that? Where are you stuck?
Thomas Starai
Thomas Starai 2019-6-23
What is the syntax for something like:
x(u,v) = ( 2-v*sin(u/2)*sin(u), 2-v*sin(u/2)*cos(u), v*cos(u/2) )
?

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采纳的回答

Star Strider
Star Strider 2019-6-24
You pretty much wrote it yourself:
x = @(u,v) [2-v.*sin(u/2).*sin(u); 2-v.*sin(u/2).*cos(u); v.*cos(u/2)];
See the documentation sections on Anonymous Functions (link) and Vectorization (link) for an extended discussion of both. The documentation for the ndgrid (link) function will also be helpful.
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Thomas Starai
Thomas Starai 2019-6-24
Symbolic math is intriging.....efficiency is not an issue.
After looking at anonymous functions, I fail to see why you couldn't just define a function without the @ operator. Can you provided some insigh as to why this is necessary?
Star Strider
Star Strider 2019-6-24
The @ operator denotes a function handle, and is necessary if you want to define it as an anonymous function. You could define it as a function file, however that is usually reserved for more complicated functions. See Function Basics for details.
You don’t have to define it as a function if you don’t want to — it will simply execute as a statement instead, although you could not then use it as a function later in your code — however in your original Question you specified that it is a function. See What Is a Function Handle? for an extended discussion.

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Ali Zain
Ali Zain 2020-1-6
y= function(t)=[0.2582;
-0.3631 cos(0.21910*(t);
0.3572 cos(0.4158)(t);
0.3473*cos(0.6180t);
0.3336*cos(0.8135t);
0.3162*cos(t);
0.2954*cos(1.1756t);
0.2714*cos(1.3383t);
0.2443*cos(1.4863t);
0.2146*cos(1.6180t);
0.1826*cos(1.7321t);
0.1485*cos(1.8271t);
0.1128*cos(1.902t);
-0.0759*cos(1.9563t);
0.0382*cos(1.9890t)]
why it is giving error...

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