I couldn't understand the problem in this code.

Question

SAHIL SAHOO il 30 Dic 2022

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Risposto: Stephen23 il 30 Dic 2022

ti = 0;
tf = 70E-8;
tspan=[ti tf];
k = (1E-3);
KC = k;

here I want to make the k and yita_mn time dependent.

y0= [(1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1)); 
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1)); 
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1)); 
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1)); 
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1)); 
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1)); 
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1)); 
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1)); 
      (1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));
      ((-3.14).*rand(20,1) + (3.14).*rand(20,1));
      0];
Invalid text character. The text ' ' contains an unsupported non-ASCII whitespace character.

Error in connector.internal.fevalMatlab

Error in connector.internal.fevalJSON
yita_mn = [
    0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1;
    1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0; 
    0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0;
    0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0;
    0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0;
    0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0;
    0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0;
    0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0;
    0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0;
    0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0;
    0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0;
    0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0;
    0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0;
    0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0;
    0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0;
    0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0;
    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0;
    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0;
    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1;
    1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
    ].*(KC);
N = 20;
tp = 1E-12;
o = sort(10e4*rand(1,20),'ascend');
[T,Y]= ode45(@(t,y) rate_eq(t,y,yita_mn,N,o,k),tspan./tp,y0);
r = ((1/20).*( exp(i.*Y(:,3)) + exp(i.*Y(:,6)) + exp(i.*Y(:,9)) + exp(i.*Y(:,12)) + exp(i.*Y(:,15)) ...
    +exp(i.*Y(:,18)) +exp(i.*Y(:,21)) +exp(i.*Y(:,24)) + exp(i.*Y(:,27)) + exp(i.*Y(:,30)) + exp(i.*Y(:,33)) ...
    + exp(i.*Y(:,36)) + exp(i.*Y(:,39)) +exp(i.*Y(:,42)) + exp(i.*Y(:,45)) + exp(i.*Y(:,48)) + exp(i.*Y(:,51)) + exp(i.*Y(:,54))+ exp(i.*Y(:,57)) + exp(i.*Y(:,60))));
figure(1)
plot(T,(Y(:,61)),'linewidth',0.8);
hold on 
plot(T,(Y(:,62)),'linewidth',2);
plot(T,(Y(:,63)),'linewidth',2);
plot(T,(Y(:,64)),'linewidth',2);
plot(T,(Y(:,65)),'linewidth',2);
plot(T,(Y(:,66)),'linewidth',2);
plot(T,(Y(:,67)),'linewidth',2);
plot(T,(Y(:,68)),'linewidth',2);
plot(T,(Y(:,69)),'linewidth',2);
plot(T,(Y(:,70)),'linewidth',2);
plot(T,(Y(:,71)),'linewidth',2);
plot(T,(Y(:,72)),'linewidth',2);
plot(T,(Y(:,73)),'linewidth',2);
plot(T,(Y(:,74)),'linewidth',2);
plot(T,(Y(:,75)),'linewidth',2);
plot(T,(Y(:,76)),'linewidth',2);
plot(T,(Y(:,77)),'linewidth',2);
plot(T,(Y(:,78)),'linewidth',2);
plot(T,(Y(:,79)),'linewidth',2);
plot(T,(Y(:,80)),'linewidth',2);
hold off
grid on
xlabel("time")
ylabel("phase difference")
set(gca,'fontname','times New Roman','fontsize',18,'linewidth',1.8);
figure(2)
plot(T,(Y(:,2)),'linewidth',2);
hold on 
plot(T,(Y(:,5)),'linewidth',2);
plot(T,(Y(:,8)),'linewidth',2);
plot(T,(Y(:,11)),'linewidth',2);
plot(T,(Y(:,14)),'linewidth',2);
plot(T,(Y(:,17)),'linewidth',2);
plot(T,(Y(:,20)),'linewidth',2);
plot(T,(Y(:,23)),'linewidth',2);
plot(T,(Y(:,26)),'linewidth',2);
plot(T,(Y(:,29)),'linewidth',2);
plot(T,(Y(:,32)),'linewidth',2);
plot(T,(Y(:,35)),'linewidth',2);
plot(T,(Y(:,38)),'linewidth',2);
plot(T,(Y(:,41)),'linewidth',2);
plot(T,(Y(:,44)),'linewidth',2);
plot(T,(Y(:,47)),'linewidth',2);
plot(T,(Y(:,50)),'linewidth',2);
plot(T,(Y(:,53)),'linewidth',2);
plot(T,(Y(:,56)),'linewidth',2);
plot(T,(Y(:,59)),'linewidth',2);
hold off
grid on
xlabel("time")
ylabel("amplitude")
set(gca,'fontname','times New Roman','fontsize',18,'linewidth',1.8);
figure(3)
plot(T,abs(r))
xlabel("time")
ylabel("orderparameter")
grid on
set(gca,'fontname','times New Roman','fontsize',18,'linewidth',1.8);
function dy = rate_eq(t,y,yita_mn,N,o,k)
dy = zeros(4*N + 2,1);
dGdt = zeros(N,1);
dAdt = zeros(N,1);
dOdt = zeros(N,1);
P = 0.5;
a = 0;
T = 2000;
tp = 1E-12;
Gt = y(1:3:3*N-2);
At = y(2:3:3*N-1);
Ot = y(3:3:3*N-0);
for i = 1:N
    dGdt(i) = (P - Gt(i) - (1 + 2.*Gt(i)).*(((At(i)))^2))./T ; 
    dAdt(i) = (Gt(i)).*(At(i));
    dOdt(i) = a.*Gt(i) + o(1,i).*tp;  
    for j = 1:N
        dAdt(i) = dAdt(i) + yita_mn(i,j)*(At(j))*cos(Ot(j)-Ot(i));
        dOdt(i) = dOdt(i) + yita_mn(i,j)*((At(j)/At(i)))*sin(Ot(j)-Ot(i));
    end
end
dy(1:3:3*N-2) = dGdt;
dy(2:3:3*N-1) = dAdt;
dy(3:3:3*N-0) = dOdt;
n1 = (1:20)';
n2 = circshift(n1,-1);
n61 = n1 +60;
n62 = circshift(n61,-1);
n80 = circshift(n61,1);
j2 =  3*(1:20)-1;
j5 = circshift(j2,-1);
j8 = circshift(j2,-2);
j59 = circshift(j2,1);
dy(n61) = (o(1,n2).' - o(1,n1).').*tp + a.*(Gt(n2) - Gt(n1)) - (k).*(y(j2)./y(j5)).*sin(y(n61)) - (k).*(y( j5)./y(j2)).*sin(y(n61)) + (k).*(y(j8)./y(j5)).*sin(y(n62)) + (k).*(y(j59)./y(j2)).*sin(y(n80));  
dy(81) = k;
dy(82) = yita_mn;
end

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Accedi per rispondere a questa domanda.

Answer 1

Sulaymon Eshkabilov il 30 Dic 2022

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Link diretto a questa risposta

https://it.mathworks.com/matlabcentral/answers/1886242-i-couldn-t-understand-the-problem-in-this-code#answer_1138372

Apri in MATLAB Online

Here is the corrected code. There were a number of unreadable white spaces (due to incorrect copy and paste), i (mean to be imaginary number and thus, it was substituted with 1i) and one missing IC for y0, etc.;

ti = 0;

tf = 70E-8;

tspan=[ti tf];

k = (1E-3);

KC = k;

y0= [(1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));

(1e-2)*rand(2,1); ((-3.14).*rand(1,1) + (3.14).*rand(1,1));

((-3.14).*rand(20,1) + (3.14).*rand(20,1)); 0; 0];

yita_mn = [ 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1;

1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0;

0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0;

0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0;

0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0;

0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0;

0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0;

0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0;

0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0;

0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0;

0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0;

0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0;

0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0;

0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0;

0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0;

0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0;

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0;

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0;

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1;

1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 ].*(KC);

N = 20;

tp = 1E-12;

o = sort(10e4*rand(1,20),'ascend');

[T,Y]= ode45(@(t,y) rate_eq(t,y,yita_mn,N,o,k),tspan./tp,y0);

r = ((1/20).*( exp(1i*Y(:,3)) + exp(1i*Y(:,6)) + exp(1i.*Y(:,9)) + exp(1i.*Y(:,12)) + exp(1i.*Y(:,15)) ...

+exp(1i.*Y(:,18)) +exp(1i.*Y(:,21)) +exp(1i.*Y(:,24)) + exp(1i.*Y(:,27)) + exp(1i.*Y(:,30)) + exp(1i.*Y(:,33)) ...

+ exp(1i.*Y(:,36)) + exp(1i.*Y(:,39)) +exp(1i.*Y(:,42)) + exp(1i.*Y(:,45)) + exp(1i.*Y(:,48)) + exp(1i.*Y(:,51)) + exp(1i.*Y(:,54))+ exp(1i.*Y(:,57)) + exp(1i.*Y(:,60))));

figure(1)

plot(T,(Y(:,61)),'linewidth',0.8);

hold on

plot(T,(Y(:,62)),'linewidth',2);

plot(T,(Y(:,63)),'linewidth',2);

plot(T,(Y(:,64)),'linewidth',2);

plot(T,(Y(:,65)),'linewidth',2);

plot(T,(Y(:,66)),'linewidth',2);

plot(T,(Y(:,67)),'linewidth',2);

plot(T,(Y(:,68)),'linewidth',2);

plot(T,(Y(:,69)),'linewidth',2);

plot(T,(Y(:,70)),'linewidth',2);

plot(T,(Y(:,71)),'linewidth',2);

plot(T,(Y(:,72)),'linewidth',2);

plot(T,(Y(:,73)),'linewidth',2);

plot(T,(Y(:,74)),'linewidth',2);

plot(T,(Y(:,75)),'linewidth',2);

plot(T,(Y(:,76)),'linewidth',2);

plot(T,(Y(:,77)),'linewidth',2);

plot(T,(Y(:,78)),'linewidth',2);

plot(T,(Y(:,79)),'linewidth',2);

plot(T,(Y(:,80)),'linewidth',2);

hold off

grid on

xlabel("time")

ylabel("phase difference")

set(gca,'fontname','times New Roman','fontsize',18,'linewidth',1.8);

figure(2)

plot(T,(Y(:,2)),'linewidth',2);

hold on

plot(T,(Y(:,5)),'linewidth',2);

plot(T,(Y(:,8)),'linewidth',2);

plot(T,(Y(:,11)),'linewidth',2);

plot(T,(Y(:,14)),'linewidth',2);

plot(T,(Y(:,17)),'linewidth',2);

plot(T,(Y(:,20)),'linewidth',2);

plot(T,(Y(:,23)),'linewidth',2);

plot(T,(Y(:,26)),'linewidth',2);

plot(T,(Y(:,29)),'linewidth',2);

plot(T,(Y(:,32)),'linewidth',2);

plot(T,(Y(:,35)),'linewidth',2);

plot(T,(Y(:,38)),'linewidth',2);

plot(T,(Y(:,41)),'linewidth',2);

plot(T,(Y(:,44)),'linewidth',2);

plot(T,(Y(:,47)),'linewidth',2);

plot(T,(Y(:,50)),'linewidth',2);

plot(T,(Y(:,53)),'linewidth',2);

plot(T,(Y(:,56)),'linewidth',2);

plot(T,(Y(:,59)),'linewidth',2);

hold off

grid on

xlabel("time")

ylabel("amplitude")

set(gca,'fontname','times New Roman','fontsize',18,'linewidth',1.8);

figure(3)

plot(T,abs(r))

xlabel("time")

ylabel("orderparameter")

grid on

set(gca,'fontname','times New Roman','fontsize',18,'linewidth',1.8);

function dy = rate_eq(t,y,yita_mn,N,o,k)

dy = zeros(4*N + 2,1);

dGdt = zeros(N,1);

dAdt = zeros(N,1);

dOdt = zeros(N,1);

P = 0.5;

a = 0;

T = 2000;

tp = 1E-12;

Gt = y(1:3:3*N-2);

At = y(2:3:3*N-1);

Ot = y(3:3:3*N-0);

for i = 1:N

dGdt(i) = (P - Gt(i) - (1 + 2.*Gt(i)).*(((At(i)))^2))./T ;

dAdt(i) = (Gt(i)).*(At(i));

dOdt(i) = a.*Gt(i) + o(1,i).*tp;

for j = 1:N

dAdt(i) = dAdt(i) + yita_mn(i,j)*(At(j))*cos(Ot(j)-Ot(i));

dOdt(i) = dOdt(i) + yita_mn(i,j)*((At(j)/At(i)))*sin(Ot(j)-Ot(i));

end

dy(1:3:3*N-2) = dGdt;

dy(2:3:3*N-1) = dAdt;

dy(3:3:3*N-0) = dOdt;

n1 = (1:20)';

n2 = circshift(n1,-1);

n61 = n1 +60;

n62 = circshift(n61,-1);

n80 = circshift(n61,1);

j2 = 3*(1:20)-1;

j5 = circshift(j2,-1);

j8 = circshift(j2,-2);

j59 = circshift(j2,1);

dy(n61) = (o(1,n2).' - o(1,n1).').*tp + a.*(Gt(n2) - Gt(n1)) - (k).*(y(j2)./y(j5)).*sin(y(n61)) - (k).*(y( j5)./y(j2)).*sin(y(n61)) + (k).*(y(j8)./y(j5)).*sin(y(n62)) + (k).*(y(j59)./y(j2)).*sin(y(n80));

dy(81) = k;

dy(82) = 0;

end

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Answer 2

Stephen23 il 30 Dic 2022

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Link diretto a questa risposta

https://it.mathworks.com/matlabcentral/answers/1886242-i-couldn-t-understand-the-problem-in-this-code#answer_1138387

Somehow you have managed to include NO BREAK SPACEs in the your code:

https://www.unicodepedia.com/unicode/latin-1-supplement/a0/no-break-space/

rather than the normal, required ASCII SPACE character:

https://www.unicodepedia.com/unicode/basic-latin/20/space/

most likely this is due to either:

copy pasting from some unreliable source (website, formatted document, etc)
third-party editor adding these characters as a "feature".

Because they all appear to be leading characters, you can probably use the MATLAB editor to remove them by selecting all text and then pressing ctrl+i. In future, use a more reliable editor or a better code source.

I used Notepad++ to highlight in magenta the NO BREAK SPACE characters in your code: