Error message "the number of elements in B and I must be the same"

Question

Sean Pierre 2015-9-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/238973-error-message-the-number-of-elements-in-b-and-i-must-be-the-same

回答： Walter Roberson 2015-9-2

Hello all,

In my RUN.m script, I call the function ode23s inside of a parfor loop where steady_state_ode is a separate script .m file. Whenever I run this code, I receive the error message that "Error using steady_state_ode (line 33) In an assignment A(I) = B, the number of elements in B and I must be the same." RUN.m

Ast = [1:4];
parpool(4)
parfor j = 1:4
Y0 = zeros(9,1); 
eta = 7;
Y0(4:4)=5;    % BemGEFc
Y0(6:6)=Ast(j:j);     % Cdc42c
onesN = ones(9);
[T,Y]=ode23s('steady_state_ode',[0 10000],Y0);
      RT   = Y(end,1)*onesN;
      RT(N/2,N/4) = 50;   %%spike peak (default N/2,N/4)=500
%      RT((N-N/10),(N-N/5))=250;     %%second spike peak
      M    = Y(end,2)*onesN;
      Em   = Y(end,3)*onesN;
      Ec   = Y(end,4)*onesN;
      RD   = Y(end,5)*onesN;
      RDIc = (Y(end,6) - (RT(N/2,N/4)*eta/N/N))*onesN;
      Ms   = Y(end,7)*onesN;
      Ems  = Y(end,8)*onesN;
      Ecs  = Y(end,9)*onesN;
end    
delete(gcp);

steady_state_ode.m (first few lines)

global k2as 
global k2b 
global k3 
global k3s
global k4a 
global k4b 
global k5a 
global k5b 
global k7 
global eta
global k8m
global k8n
global k8h
global k9m
global k9n
global k9h
%%equations
Mt = y(2)+y(7);
k8 = k8m*(  Mt.^k8n).*(((k8h.^k8n)+(  Mt.^k8n)).^(-1));
k9 = k9m*(y(9).^k9n).*(((k9h.^k9n)+(y(9).^k9n)).^(-1));
dy = zeros(9,1);
% RT      
dy(1:1) =  ((k2a*y(3:3)  +k3*y(2:2)  ).*y(5:5) - k2b*y(1:1)  - k4a*y(3:3).*y(1:1) + k4b*y(2:2) - k7*y(4:4).*y(1:1)) ...
        +((k2as*y(8:8) +k3s*y(7:7) ).*y(5:5) - k4a*y(8:8).*y(1:1) + k4b*y(7:7) - k7*y(9:9).*y(1:1));

I tried setting multiple breakpoint both in steady_steate_ode.m and in the parfor loop but the breakpoints in steady_state_ode are never reached and code execution in the RUN.m file stops with out of these errors before any code is executed in steady_state_ode.m. Matlab does not let me set breakpoints inside of the parfor loop. I am unsure about where this issue stems.

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Stephen23 2015-9-2

编辑：Stephen23 2015-9-2

You should not call your script run, because this is the name of very commonly used MATLAB function run.

For the same reason you should never call any function/script/variable length, size, i, j, cd, etc, etc.

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Answer 1

Walter Roberson 2015-9-2

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/238973-error-message-the-number-of-elements-in-b-and-i-must-be-the-same#answer_191061

http://www.mathworks.com/matlabcentral/answers/129684-global-variables-call-function-parfor

Your global variables are all empty, and empty times anything is empty, and empty plus anything is empty. Your entire expression comes out empty, which cannot be stored in a location that is required to be 1 location wide.