What does "if 1 ..." means? When is the if condition applied? What does that "1" mean?

So I'm analyzing a code. And there is this if condition : "if 1 ...". I don't understand when this condition is applied? What does the "if 1" mean?

Answer 1

[madhan ravi]

if 1 means nothing here

Maybe

if a==1

disp('yes')

end

[madhan ravi]

The above explains when a variable a equal to 1 then yes will be displayed because the condition is satisfied.

[madhan ravi]

See https://www.mathworks.com/help/matlab/ref/if.html for clear explanation

[Povilas Derbutis]

There's this code in the program.

if 1
  dx=sum(abs(x))*1e-5; f0=f(x);
  for i=1:n
      x1=x;x1(i)=x1(i)+dx; f1=f(x1); A(:,i)=(f1-f0)/dx;
  end
else,
  A=eye(n)*11;
end

I don't understand when is the "if" portion applied and when does the "else" occur? On what condition?

[Image Analyst]

The programmer just set the condition to 1 to make sure the first block of code gets executed.

Hopefully it was just a temporary thing otherwise the whole if/else is not even needed.

[madhan ravi]

Thank you sir Image Analyst , as he already mentioned it’s not even needed in this case