how can i fix it please

[Karuppasamy Kalimuthu]

use & for and

Answer 1

[Image Analyst]

Replace "and" by a double (not single) ampersand : &&

Get rid of lines 4 and 6. MATLAB does not have a "do" and does not start and end blocks with braces.

Your while loop doesn't seem to have any way to exit if it goes into it. How could soc and Ppv change if they're variables? If they're functions, then perhaps they could come back with different values each time, but they're not. They're either scalars or arrays (which is it?).

But there's also a problem in that your while has no failsafe - no limit on the number of iterations so you could get into an infinite loop situation. More robust code would be:

maxIterations = 100000; % Way more than you think you'd ever need.
loopCounter = 0; % The failsafe
while (soc < 80) && (Ppv > 4000) && loopcounter < maxIterations
    u = 0;
    % Then maybe some other code that changes soc or Ppv.
    % Finally increment the loop counter.
    loopCounter = loopCounter + 1;
end
if loopCounter >= maxIterations
    warningMessage = sprintf('Loop exited early after %d iterations', loopCounter)
    uiwait(warndlg(warningMessage));
end

[khalil chnini]

thnk you for answering

the output u is an order to run or break a genrator...

and soc is batterie's🔋 charge degree (it ll be charged by the generator)...

and Ppv is the power of photovoltaïque

so first u = 0 next change u = 1 when soc< 20% and Ppv < 4000 ....and it has to be fixed in 1 untel the batterie🔋charged (sos >80) or Ppv >4000

[Image Analyst]

How does soc or Ppv ever get changed inside the loop?

[khalil chnini]

w enter them as an input throu (go to ) block

[Image Analyst]

OK, then you should break out of the loop if/when the criteria gets met.

[khalil chnini]

how i do this

[Image Analyst]

Somehow you are changing either soc or Ppv inside the loop. When the condition below

(soc < 80) && (Ppv > 4000) && loopcounter < maxIterations

is false, the loop will automatically exit. You said that you were getting those values inside the loop via asking the user with an input() statement, which is how I interpreted this: "w enter them as an input throu (go to ) block"

Answer 2

[Karuppasamy Kalimuthu]

and to be replaced by &

[John D'Errico]

Actually, no. You want to use && in an if statement. There is a difference.

[Karuppasamy Kalimuthu]

Yes. && is correct.

[Walter Roberson]

Either & or && can be used when both sides are scalars, but && would be more efficient in such a case.

If the left side is non-scalar, or the left side is scalar non-zero and the right side is non-scalar, then & must be used instead of && .