# How can I calculate this triple integral when I have a rotated euler matrix. All that is attached in the file,

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Anouar CHAABANI on 3 Feb 2016
Edited: Walter Roberson on 5 Feb 2016
function C_ij = VoigtModelFunction
Cs_kl = [250, 88.3, 87.5, 0, 0, 0 ; ...
88.3, 250, 87.5, 0, 0, 0 ; ...
87.5, 87.5, 92, 0, 0, 0 ; ... %for example(6x6)
0, 0, 0, 22.7, 0, 0 ; ...
0, 0, 0, 0, 22.7 0 ; ...
0, 0, 0, 0, 0, 82.20];
alpha = 0.15235;
if nargin == 0
euler = randBunges;
end
euler = euler/180*pi;
phi1 = euler(1);
phi2 = euler(2);
Phi = euler(3);
alpha=0.15235
Crot= MS_rotEuler(Cs_kl,phi1,Phi,phi2);
VoigtModel = @(phi1, phi2, phi)Crot*ODF_W_function(phi2, alpha).*sin(phi2(i));
C_ij =Crot.*integral3(VoigtModel,0,2*pi,0,2*pi,0,pi);
end
>> VoigtModelFunction
alpha =
0.1524
CC =
250.0529 88.2460 87.5006 0.0157 -0.2066 -0.2595
88.2460 249.9560 87.5318 2.3906 0.0042 0.2677
87.5006 87.5318 92.0344 0.8356 -0.0703 -0.0026
0.0157 2.3906 0.8356 22.7319 -0.0006 -0.0967
-0.2066 0.0042 -0.0703 -0.0006 22.7250 1.2140
-0.2595 0.2677 -0.0026 -0.0967 1.2140 82.1214
Assignment has more non-singleton rhs dimensions than non-singleton subscripts
Error in ODF_W_function (line 32)
W(:,ii) = (1./(alpha(ii)*((2*pi).^0.5))) * ...
Error in VoigtModelFunction>@(phi1,phi2,phi)Crot*ODF_W_function(phi2,alpha).*sin(phi2(i)) (line 25)
VoigtModel = @(phi1, phi2, phi)Crot*ODF_W_function(phi2, alpha).*sin(phi2(i));
Error in integral3>@(y,z)FUN(x(1)*ones(size(z)),y,z) (line 138)
@(y,z)FUN(x(1)*ones(size(z)),y,z), ...
Error in integral2Calc>integral2t/tensor (line 228)
Z = FUN(X,Y); NFE = NFE + 1;
Error in integral2Calc>integral2t (line 55)
[Qsub,esub] = tensor(thetaL,thetaR,phiB,phiT);
Error in integral2Calc (line 9)
[q,errbnd] = integral2t(fun,xmin,xmax,ymin,ymax,optionstruct);
Error in integral3/innerintegral (line 137)
Q1 = integral2Calc( ...
Error in integralCalc/iterateScalarValued (line 314)
fx = FUN(t);
[q,errbnd] = iterateScalarValued(u,tinterval,pathlen);
Error in integralCalc (line 75)
Error in integral3 (line 121)
Q = integralCalc(@innerintegral,xmin,xmax,integralOptions);
Error in VoigtModelFunction (line 27)
C_ij =Crot.*integral3(VoigtModel,0,2*pi,0,2*pi,0,pi);

Mike Hosea on 5 Feb 2016
INTEGRAL3 does not support integrating a matrix of functions. For example, suppose you wanted to integrate
f = @(x,y,z)[cos(x).*sin(y).*z, cos(2*x).*sin(2*y).*2.*z; cos(3*x).*sin(3*y).*3.*z, cos(4*x).*sin(4*y).*4.*z];
over the region x = 0 to pi, y = 0 to pi, and z = 0 to pi. INTEGRAL3 does not do that. INTEGRAL3 requires that if you give your function f inputs of a given size, the output will be the same size. But the function above produces a 2-by-2 matrix when you give it a scalar:
>> f(0,0,0)
ans =
0 0
0 0
>> f(pi/4,pi/8,pi/24)
ans =
0.035421201924390 0.000000000000000
-0.256543038244258 -0.523598775598299
The only way to use INTEGRAL3 is to split this problem up into the component problems. You can easily integrate f11 = @(x,y,z)cos(x).*sin(y).*z and f12 = @(x,y,z)cos(2*x).*sin(2*y).*2.*z and so forth. Before you attempt to use INTEGRAL3, do some quality control on your integrand function. Make sure it returns the right results, and make sure if the arguments are m-by-n matrices, it returns an m-by-n matrix of results. This must be done element-wise. It cannot matter whether you evaluate the 6 points of a 2-by-3 matrix one at a time by passing in each set of scalar inputs for x, y, and z or all at once by passing in 2-by-3 arrays of inputs for x, y, and z.