MATLAB: Error in Intergral with error matrix dimensions must agree.

matrix dimensions must agree integral arrayvalued

xbar = [0.2 0.4 0.6 0.8]; tbar = [0:0.001:2]; xsbar = 2.*tbar – tbar.^2;

for i=1:length(tbar) if xbar(1) <= xsbar(i) hbar(i) = ((xbar(1) – xsbar(i))^2)/ (9*(tbar(i)^2)); ubar(i) = (2/3)* (1 – 2*tbar(i) + (xbar(1)/tbar(i))); else hbar(i) = 0; ubar(i) = 0; end end v = length(hbar); fun = @(z) ubar(z); uavg = 1/hbar * integral(fun,0,v,'ArrayValued',true)

Error: Error using / Matrix dimensions must agree.

Best Answer

Use "trapz" instead of "integral".

Best wishes

Torsten.

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MATLAB: Fron Python to Matlab

I can't run your code right now in python so I can't compare the results but most of these lines should be the correct conversion.

See help normrnd to pull numbers from a given gaussian distribution.

npts = 1000; % number of points in uncorrelated data set
Emax = 10;  % energy goes from zero to Emax
Ec = 0.1; % correlation energy
kT = 0.25;
% create discrete values of Energy
E = linspace(0, Emax, npts);
E_extra = linspace(0, Emax, 2*npts-1); %sometimes we need this size to convolve
%PLOT 1: Tbar correlated
Tbar = normrnd(0, 1, 1, 2*npts-1)
y = exp(- ((E-Emax/2.)/Ec).*2);
%convolution between Tbar and correlation energy
Tbar_c = conv(y, Tbar, 'same'); %valid = no edge effects
% normalize the data (maximum=1, minimum=0)
Tbar_c = Tbar_c - min(Tbar_c);
Tbar_c = Tbar_c/max(Tbar_c);
% plot the correlated data set
plot(E, Tbar_c)

MATLAB: How can i integrate a function

As soon as you write the formula a function instead of an anonymous function, you can debug it:

% Create anonymous function to provide parameters:
fun4 = @(y) fun4fcn(y, d1i, d2i, bx, s, tau);
...  Call the integrator
% The actual function:
function dy = fun4fcn(y, d1i, d2i, bx, s, tau)
dy = (y .^ 2 - d1i' * y + d2i) * f1 * exp(-(y-bx) .^ 2 ./ (2 * s * tau));
end

Now use the debugger:

dbstop if error

When Matlab stops at the error, you can check the dimensions of the variables. Because there is only one "+" operator, I guess that d2i has an unexpected shape.

Best Answer

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MATLAB: Fron Python to Matlab

MATLAB: How can i integrate a function

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