On 8-Jan-2009, James Sherman Jr. wrote:
| While I don't have octave available currently, I believe your problem is
| that the quad function requires the first input to be a function of one
| input. So, for a single u value it would look like:
|
| >function y=int(x)
| >y=sin(10.*x);
| >endfunction;
|
| Then the quad line should work. Now if you want to dynamically change the u
| value, then you might do something like:
|
| index = 1;
| results = zeros(size([-10:0.1:10]));
|
| for u = [-10:0.1:10]
|
| % creates the function as a string where the first input to int is the
| current value of u
| function_string = sprintf('int(%d, x)', u);
|
| % creates an inline function that only has one input 'x', because we want
| u to be constant.
| int_inline = inline(function_string, 'x');
|
| results(index) = quad('int_inline',0,2.*pi);
|
| index = index + 1;
| end
|
| There may be a better way to do this, but I think this should work.
Using an anonymous function is a bit simpler:
rng = -10:0.1:10;
results = zeros (size (rng));
idx = 1;
for u = rng
results(idx++) = quad (@(x) sin(u*x), 0, 2*pi);
endfor
jwe
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