how to use quad ?

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alaa akkoush
alaa akkoush 2018-1-7
评论： Jan 2018-11-13
26219869_1573850829369116_6603952483732459120_n.jpg
I have to integrate the following function where alpha, w1, v1, k1 are discrete data (arrays of 194 elements each)... T is temperature, suchthat for every T I should have one G
function [G1] = try1(k1, alfa, w1, v1, T)
kb=1.38064852*10^(-23);
h=1.0545718*10^(-34);
c=h/(kb);
constant=(h^2)/((2*(2*pi)^3)*(kb));
q1 = csvread('q1.csv');
alfa= csvread('alfa.csv');
alldata = csvread('all.csv');
q1(end) = [];
w1 = alldata(:,1);
v1= alldata(:,7);
k1=q1*(pi/(5.431));
T=300:1:1000;
for i=1:length(T)
integrand = @(k1,alfa,v1,w1,T)(constant.*(1./T^2).*alfa.*w1.^2.*abs(v1).*exp(c*w1./T)./(exp(c*w1./T)-1).^2); G1=quad(@(k1)integrand(k1,alfa,v1,w1,T(i)),0,2.51365000000000);
end
end
  1 个评论
Jan
Jan 2018-11-13
Please do not delete questions, which got an answer already, because this is insulting for the persons, who spent their time for helping you.

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回答（1 个）

Star Strider
Star Strider 2018-1-7
We cannot run your code.
However, you appear to be integrating a function with 3 equal-sized vectors, ‘alfa’, ‘w1’, and ‘v1’, so the quadv (link) function appears to be most appropriate.
Note that if you have R2012a or later, the integral function with 'ArrayValued',true would be the best option.

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