MATLAB: Relational operations problems (real and imag parts)

imagMATLABreal

Hello all!

I want to replace this line

if imag(LAMBD(m,m)) ~= 0

into

if imag(LAMBD(m,m)) == 0

because the operation "~=" (even without imag()) is testing the imaginary part of LAMBD, but it doesn't work.

I have no idea why…

Thanks,

Kate

It seems that in this case "~=" doesn't mean testing the imginary part of LAMBD. if f(x) ~= 0 menas that f(x) is close to zero...

To find a value of

that works for your robot model you can use PID Tuner app.

To understand PID controllers and their implementation (also includes real scenarios), refer to:

Hope it helps.

X = (1:35)' * (1+1i);  % not being very creative here

Now, there are lots of ways to just kill the real part of only the 34'th element. This will work:

X(34) = X(34) - real(X(34));

Perhaps simpler, because it will not require the subtraction.

X(34) = 1i*imag(X(34));

Or,

X(34) = 0 + 1i*imag(X(34));

Another one, using complex.

X(34) = complex(0,imag(X(34));

In any event, did it work?

X(33:35)
ans =
         33 +         33i
          0 +         34i
         35 +         35i

Of course it did.