How can i scale certain values in a vector?

I have a certain vector with data and now i want to scale all values below 0 to values between -1 and 0 and all values above 0 i want to scale to values between 1 and 0.

So i have a vector A All the values below 0 (<0) i want to devide by a certain value all the values above 0 (>0) i want to devide to another certain value all the values which are 0 should stay 0.

Is this possible to do with matlab?

Answer 1

[Star Strider]

See if this does what you want:

V = 2*randn(1,20);                      % Create Vector

VH = find(V >= 0);                      % Indices Of V >= 0
VL = find(V < 0);                       % Indices Of V < 0

VHScaled(VH) = V(VH)/max(V(VH));        % Scale & Map To Original Indices
VLScaled(VL) = -V(VL)/min(V(VL));

figure(1)
plot(V)
hold on
plot(VHScaled)
plot(VLScaled)
hold off
grid
grid

[Marjolein Thijssen]

Thanks, this really helped!

[Star Strider]

My pleasure!

Answer 2

[dpb]

ix=x>0;                         % logical vector +ive loc's
x(ix)=x(ix)/max(x(ix));         % normalize +ive
x(~ix)=x(~ix)/max(abs(x(~ix))); % normalize -ive