MATLAB: Error using sym/cat>checkDimensions (line 70) CAT arguments dimensions not consistent.

ode15i

Hi everyone, On running the code on the attachment/or dropbox link
https://www.dropbox.com/s/l5f3096vinkxmuc/ODE15iExample.m?dl=0
I get the error message:
Error using sym/cat>checkDimensions (line 70)
CAT arguments dimensions not consistent.
Error in sym/cat>catMany (line 35)
[resz, ranges] = checkDimensions(sz,dim);
Error in sym/cat (line 27)
    ySym = catMany(dim, args);
Error in sym/vertcat (line 19)
    ySym = cat(1,args{:});
Error in ODE15iExample (line 8)
eqs = [diff(c(t),t) == 1 / 1.5e-6 * (1.666667e-5 * 6.51332e-2 - 1.666667e-5 * c(t)) - ((c(t) * 8.314 * 323.15 - 149 * b(t)) / (1 /
4.14e-6) + (149 / ((1 + (1.39e-9 * d(t)) / (2.89e-9 * e(t))) * 8.4e-4)))...
What can I do?

Best Answer

I did not troubleshoot all the errors that might be in your code, only the ones in the ‘eqs’ vector. Spaces are important, and please do not use continuation ellipses when you intend a new line. Rather than manually remove the spaces, I just put every line in parentheses. Note that the continuation line in the ‘diff(v(t),t) ==’ line, there is a missing operator. I used a + creating ‘+ n(t)’, so if I guessed wrong, replace it appropriately.
Try this version of ‘eqs’:
eqs = [(diff(c(t),t) == 1 / 1.5e-6 * (1.666667e-5 * 6.51332e-2 - 1.666667e-5 * c(t)) - ((c(t) * 8.314 * 323.15 - 149 * b(t)) / (1 / 4.14e-6) + (149 / ((1 + (1.39e-9 * d(t)) / (2.89e-9 * e(t))) * 8.4e-4))) );
(diff(g(t),t) == 1/1.5e-6 * (-1.666667e-5 * g(t)) -( 9.598e-4 * ( 1 + (1.39e-9 * d(t)) /( 3.53e-9 * h(t))) * (g(t) * 8.314 * 323.15 / 5.15e3 - i(t))) );
(diff(e(t),t) == ((c(t) * 8.314 * 323.15 - 149 * b(t)) / (1 / 4.14e-6) + ( 149 / ((1 + (1.39e-9 * d(t)) / ( 2.89e-9 * e(t))) * 8.4e-4)) - (0.162 * exp(5153/323.15) * (((d(t) * k(t)) / 1.07e-7) - 1) * (10 / ((d(t) * k(t)) / 1.07e-7)))) );
(diff(h(t),t) == (9.598e-4 * ( 1 + (1.39e-9 * d(t)) / (3.53e-9 * h(t))) * (g(t) * 8.314 * 323.15 / 5.15e3 - i(t))) - (-8.825e-3 * 12.54 * 100.0869 * m(t) * n(t) * (1-(0.84*n(t)) / (1 + 0.84 * n(t)))) );
(diff(u(t),t) == (-8.825e-3 * 12.54 * 100.0869 * m(t) * n(t) * (1 - (0.84 * n(t)) /(1 + 0.84 * n(t)))) - (0.162 * exp(-5153/323.15) * (((d(t) * k(t)) / 1.07e-7) - 1 * (10 /((d(t) * k(t)) / 1.07e-7)))) );
(diff(m(t),t) == -m(t) * (-8.825e-3 * 12.54 * 100.0869 * m(t) * n(t) * ( 1 - (0.84 * n(t)) / (1 + 0.84 * n(t)))) * 100.0869 / 2703 );
(diff(v(t),t) == (-8.825e-3 * 12.54 * 100.0869  * m(t) * n(t) * (1 - (0.84 * n(t)) / (1 + 0.84 * n(t)))) * 258.30 / 2540 ...
+ n(t) +  2 * d(t) - ((e(t) * 6.24 * n(t)) / (n(t)^2 + 6.24 * n(t) + 6.24 * 5.68e-5)) -  2 * ((e(t) * 6.24 * 5.68e-5) / (n(t)^2 + 6.24 * n(t) + 6.24 * 5.68e-5)) - ((h(t) * 1.7e-3 *n(t)) / (n(t)^2 + 1.7e-3 * n(t) + 1.7e-3 * 6.55e-8)) - 2 * ((h(t) * 1.7e-3 * 6.55e-8) / (n(t)^2 + 1.7e-3 * n(t) + 1.7e-3 * 6.55e-8)) - 5.3e-8 / n(t) == 0) ;
(1.7e-3 == n(t) * r(t) / i(t) );
(6.55e-8 == n(t) * s(t) / r(t) );
(6.24 == n(t) * q(t) / b(t) );
(5.68e-5 == n(t) * k(t) / q(t) );
(5.3e-8 == n(t) * tt(t) );
(e(t) == b(t) + q(t) + k(t) );
(h(t) == i(t) + r(t) + s(t) );
(u(t) == i(t) + r(t) + s(t))];
If you want ‘eqs’ to be a row vector instead of a column vector, replace the semicolons at the end of each line with commas.
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