function solve return 'Unable to perform assignment because the left and right sides have a different number of elements.'

Question

Federico Nebuloni 2022-1-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1633300-function-solve-return-unable-to-perform-assignment-because-the-left-and-right-sides-have-a-differen

评论： KSSV 2022-1-21

Hi everyone,

trying to run this code where every parameter is known, only 'gamma' is my variable and 'hs_data' is a known function of 't_data'

hs_data = hs_Lderiv./1000; %meter
t_data = t; %seconds
dh = diff(hs_data);
dt = diff(t_data);
syms gamma
dhdt = zeros(size(t_data)-1);
gammaL = zeros(size(hs_data)-1);
gammaH = zeros(size(hs_data)-1);
for n = 1:length(t_data)-1
    dhdt(n)= dh(n)./dt(n);
    gammaL(n) = solve(dhdt(n) == -(1.2269.*gamma.*a_channel.^7.*hs_data(n).^4)./(pi().*mu.*L.*(a_source.^2+hs_data(n).^2).^5), gamma);
    gammaH(n) = solve(dhdt(n) == -((2.*gamma)./(26.08.*pi().*mu.*a_channel.*L.*(a_source.^2+hs_data(n).^2))).*((((2.*a_channel.^2.*hs_data(n))./(a_source.^2+hs_data(n).^2))-((dRho.*g.*a_channel.^2.*hs_data(n))./(2.*gamma))).^4), gamma);
end

the first function 'solve' (the one returnin 'gammaL') works perfectly but the second one always returns the error 'Unable to perform assignment because the left and right sides have a different number of elements.'

is there a very trivial error i cannot find?

thank you very much in advance

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Answer 1

KSSV 2022-1-21

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1633300-function-solve-return-unable-to-perform-assignment-because-the-left-and-right-sides-have-a-differen#answer_878890

在 MATLAB Online 中打开

hs_data = hs_Lderiv./1000; %meter
t_data = t; %seconds
dh = diff(hs_data);
dt = diff(t_data);
syms gamma
dhdt = zeros(size(t_data)-1);
gammaL = cell(size(hs_data)-1,1);
gammaH = cell(size(hs_data)-1,1);
for n = 1:length(t_data)-1
    dhdt(n)= dh(n)./dt(n);
    gammaL{n} = solve(dhdt(n) == -(1.2269.*gamma.*a_channel.^7.*hs_data(n).^4)./(pi().*mu.*L.*(a_source.^2+hs_data(n).^2).^5), gamma);
    gammaH{n} = solve(dhdt(n) == -((2.*gamma)./(26.08.*pi().*mu.*a_channel.*L.*(a_source.^2+hs_data(n).^2))).*((((2.*a_channel.^2.*hs_data(n))./(a_source.^2+hs_data(n).^2))-((dRho.*g.*a_channel.^2.*hs_data(n))./(2.*gamma))).^4), gamma);
end