"plot" and "stairs" in the same figure with different axis

Hello guys, for first excuse me for my bad English. I'm trying to plot in the same figure a graphic with "plot" function and a graphic with "stairs" function to represent the same signal, once analog and once quantized. So, I want to visualize in one figure:

• the analog signal using plot function, X axis at the bottom and Y axis at the left;
• the quantized signal using stairs function, X axis at the top and Y axis at the right;

I tried to specify axis's properties but everytime the output of plot function disappears; in addition to this, I can't display even just stairs function's output with X axis on the top and Y axis on the left.

ax1 = axes('XAxisLocation','bottom','YAxisLocation','left'
ax2 = axes('XAxisLocation','top','YAxisLocation','right');
plot(ax1,P,V_ina)
hold on 
stairs(ax2,st,V_adc)

The last command doesn't work in every case. I tried also to specify parent's relationship for stairs function but the code still does not work. Obviously plot and stairs work well together usign "hold on" and the same axis. There is a guide that explains how to do a similiar thing but using only "line" function; can anyone help me? It is really strange that there is a yyaxis funtion and a similiar command for X axis doesn't exist.

[madhan ravi]

can you provide the datas to test?

[Andrea Frascella]

The data are only 4 vectors, I attach them here. Thank you for the interest.

Answer 1

[madhan ravi]

x=rand(1,10);
y=1:10;
ax = gca; % current axes
ax1=plot(x,y)
hold on 
ax2=stairs(x,y)
ax1=gca;
ax2 = axes('Position', get(ax1, 'Position'),'Color', 'none');
set(ax2, 'XAxisLocation', 'top','YAxisLocation','Right');

[madhan ravi]

try the above

[Andrea Frascella]

I want the X axis for stairs function on the top, this code use the same X axis for the two functions.

[madhan ravi]

see edited now (example)

[Andrea Frascella]

So, I must use plot and stairs first and after I can modify axis's position. It works, thanks a lot!

[madhan ravi]

yes exactly!, Anytime :)