How to make the negative sign of y axis to be up ?

How to make the negative sign of y axis to be up?

Answer 1

[dpb]

plot([-1000:100:100]);
hAx=gca;
hAx.YDir='reverse';

See axes documentation for all the details...

Answer 2

[VBBV]

ydata = -900:100:100

ydata = 1x11

-900 -800 -700 -600 -500 -400 -300 -200 -100 0 100

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xdata = ydata.*ones(1,length(ydata))

xdata = 1x11

-900 -800 -700 -600 -500 -400 -300 -200 -100 0 100

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plot(xdata,ydata)
yticks = ydata;
yticklabels(fliplr(yticks))

[dpb]

ydata = -900:100:100;
xdata = ydata;
plot(xdata,ydata)
hAx=gca;
hAx.YDir='reverse';

The above reverses the actual relation between the x, y values; as defined, y==x so the negative x and y values should be associated visually.