Size mismatch (size [1 x 11] ~= size [1 x 10]).

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jose luis huayanay villar 2020-7-3

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https://ww2.mathworks.cn/matlabcentral/answers/558845-size-mismatch-size-1-x-11-size-1-x-10

编辑： Walter Roberson 2020-7-9

采纳的回答： Walter Roberson

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Greetings to al my name JOSE LUIS HUAYNAY VILLAR, I have the following error problem;

Size mismatch (size [1 x 11] ~= size [1 x 10]).

the program indicates the error to me in this line, that seems strange to me

Function 'MATLAB Function3' (#169.624.635), line 21, column 17: "D(k+1)+D(j)" Launch diagnostic report.

and this is my code, please someone help me:

function dot_theta = fcn(theta,theta_0,theta_f)
dot_theta=size(10,1);
D=size(10,1);
K=size(10,1);
L=50;  %comprimento
z=linspace(0,L,10); 
theta_r = 0.218;     
alpha= 0.0115;     
K_s = 31.6;         
theta_s=0.52;      
dz=L/length(z);
b=1/(2*dz^2);
n = 2.03;
m=1-(1/n);
i=2:length(z),
j=1:length(z),
k=0:length(z),
D=(K_s*(1-m)/(alpha*m*(theta_s-theta_r)))*dot(theta,theta);
K=(K_s*(1-m)/(alpha*m*(theta_s-theta_r)))*dot(theta,theta);
dot_theta =b*((D(k+1)+D(j))*(theta(k+1)-theta(j))- b*(D(i-1)+D(j))*(theta(j)-theta(i-1))+((K(j)-K(i-1))/Delta_z));

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Answer 1

Walter Roberson 2020-7-3

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https://ww2.mathworks.cn/matlabcentral/answers/558845-size-mismatch-size-1-x-11-size-1-x-10#answer_460433

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i=2:length(z),

That is 2:10

j=1:length(z),

That is 1:10, which is one element longer than i.

D(i-1)+D(j)

D(i-1) becomes D(1 to length(z)-1) which is D(1 : 9)

D(j) is D(1:length(z)) which is D(1:10)

The two items are different lengths and cannot be subtracted.

You have similar problems for theta(k+1) vs theta(j)

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jose luis huayanay villar 2020-7-9

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excuse me, perform as you advised me

function dot_theta = Richards(theta,K,D,thetaz_0,thetaz_f)
L=1;  %comprimento
z=linspace(0,L,100); % espaco de discretizacao
dz=L/length(z);
b=1/(2*dz^2);
i=max([1 0 2])+1:length(z),
dot_theta=b*(D(i)+D(i-1)).*(theta(i)-theta(i-1))- b*(D(i-2)+D(i-1)).*(theta(i-1)-theta(i-2))+((K(i-1)-K(i-2))/dz);

and I got the following error. in which part have I failed?

i = Columns 1 through 15 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Columns 16 through 30 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Columns 31 through 45 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 Columns 46 through 60 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 Columns 61 through 75 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 Columns 76 through 90 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 Columns 91 through 98 93 94 95 96 97 98 99 100

Index exceeds array dimensions. Index value 99 exceeds valid range [1-98] of array D. Error in 'simulacao_julio4/MALATB Function1' (line 15) dot_theta=b*(D(i)+D(i-1)).*(theta(i)-theta(i-1))- b*(D(i-2)+D(i-1)).*(theta(i-1)-theta(i-2))+((K(i-1)-K(i-2))/dz);

jose luis huayanay villar 2020-7-9

编辑：Walter Roberson 2020-7-9

在 MATLAB Online 中打开

function D = fcn(theta)
L=1;  %comprimento
z=linspace(0,L,100); % espaco de discretizacao
theta_r = 0.218;     % conteudo de agua residual
alpha= 0.0115;      %parametro de Van Genuchten 1/cm (Van Genuchten, 1980)
K_s = 31.6;         % conductividade de saturacao cm/t
theta_s=0.52;       %conteudo de agua saturado 
n = 2.03;
m=1-(1/n);
i=max([1 0 2])+1:length(z),
D =(K_s*(1-m)/(alpha*m*(theta_s-theta_r)))*(theta(i-2).^(0.5-(1/m))./(1-(theta(i-2).^(1/m)))).*((1-(1-(theta(i-2).^(1/m))).^m).^2);