How to run two independent functions simultaneously?

Question

sa za 2013-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/87247-how-to-run-two-independent-functions-simultaneously

评论： Walter Roberson 2019-10-4

Hi.I have two functions for creating numbers.lu and lu1(similar to lu).lu 's out put is matrix with 4 columns (rows depend on inputs (same for lu1) )and i have dual core CPU.(numbers in each function is related, but two functions are Independent).

    function Y=lu(a,b,c,d,e,k)
  [T,Y]=ode45(@rigid,[0 e],[a b c d]);
  function dy=rigid(t,y) %#ok<INUSL>
  dy=zeros(4,1);
  dy(1)=36*(y(2)-y(1))+y(4);
  dy(2)=-(y(1)*y(3))+20*y(2);
  dy(3)=y(1)*y(2)-3*y(3);
  dy(4)=y(1)*y(3)+k*y(4);
  end
  end

I want to using parallel computing for my two functions by using this code

matlabpool ('open',2);
parfor i = 1:2
    if i == 1
 xc1=lu(0.10001,0.8,12,0.2,1138,1.2);
    else
xc2=lu1(3,0.40001,9,0.7,1010,3.25)
end

in normal code xc1 is matrix with this size[91713 4](same for xc2). is it true way for parallel computing for two functions ? Importantly,how can I using xc1 and xc2 in other parts of my code?

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Matt J 2013-9-15

lu() is the name of a pre-existing MATLAB function. It might be wise to choose a different name.

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Answer 1

Matt J 2013-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/87247-how-to-run-two-independent-functions-simultaneously#answer_96786

编辑：Matt J 2013-9-15

在 MATLAB Online 中打开

If I were to do this, I would probably do it as below.

    funcs={@lu,@lu1};
    arguments={0.10001,0.8,12,0.2,1138,1.2;...
          3,0.40001,9,0.7,1010,3.25};
    solutions=cell(1,2);
      parfor i = 1:2
        solutions{i}=funcs{i}(arguments{i,:});
      end

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NGOC TAM LAM 2019-10-4

在 MATLAB Online 中打开

Hello @Matt J

I tried to test with my really simple code as below, but the error is "Too many output arguments."

function func1(x,y)
plot(x, y), xlabel('x'), ylabel('Sin(x)'), title('Sin(x) Graph'),
grid on, axis equal
end
function func2(x,y)
plot(x, y), xlabel('x'), ylabel('Cos(x)'), title('Cos(x) Graph'),
grid on, axis equal
end

the main is

x = 0:0.01:10;
y1 = sin(x);
y2 = cos(x);
funcs = {@func1, @func2} ;   % let fun1, fun2 be two functions 
arguments = {x y1;x y2} ;   % write the inputs of each function 
solutions = cell(1,2);                 % initialize the solution 
% use of parfor 
parfor ii = 1:2
      solutions{ii}=funcs{ii}(arguments{ii,:});
end