Plot two spectrum plot in one spectrum plot?

Hi ,

I have a question regarding plotting of two spectrum plots into one spectrum but resultant plot must be appended after the first plot.

I have saved spectrum as a figure.

I have read many threads all of them are supporimposing or making sub plots.

My query is that how to join one figure plot line with second figure plot line.

I have attached as a reference two figures.

Both figures have same x axis label(0-400) but I want resultant plot must have consistant values like 0 - 800.

Answer 1

[Ameer Hamza]

Try this, using the two fig files you shared.

fig1 = openfig('Ichannel0_400_1.fig');
fig2 = openfig('Ichannel_400_1_800.fig');

ax1 = findobj(fig1, 'type', 'axes');
ax2 = findobj(fig2, 'type', 'axes');

l1 = findobj(fig1, 'type', 'line');
l2 = findobj(fig2, 'type', 'line');

l1.XData = [l1.XData l2.XData+l1.XData(end)];
l1.YData = [l1.YData l2.YData];

ax1.XLim = [min(l1.XData) max(l1.XData)];

figure(fig1);

[Muhammad Rizwan]

thanks for prompt response;
Dear is it possible to also change some y values of the plot.Means I want to get rid of ambiguos peaks 

[Ameer Hamza]

Can you mark the peaks on an image which you want to remove?

[Muhammad Rizwan]

yes at 400 and 800 .

[Ameer Hamza]

Something like this?

fig1 = openfig('Ichannel0_400_1.fig');
fig2 = openfig('Ichannel_400_1_800.fig');

ax1 = findobj(fig1, 'type', 'axes');
ax2 = findobj(fig2, 'type', 'axes');

l1 = findobj(fig1, 'type', 'line');
l2 = findobj(fig2, 'type', 'line');

l1.XData = [l1.XData l2.XData+l1.XData(end)];
l1.YData = smoothdata([l1.YData l2.YData]);

ax1.XLim = [min(l1.XData) max(l1.XData)];

figure(fig1);

[Muhammad Rizwan]

Thanks Ameer Hamza

[Ameer Hamza]

I am glad to be of help.

[Muhammad Rizwan]

Hi Ameer,

I want to ask that is there a way to normalize the plot too?

Means values start from zero rather than sum value.

[Ameer Hamza]

Can you explain more? Do you want the value of start of the signal to be 0?

[Muhammad Rizwan]

Yes Ameer Y axis value must be zero for 0 Hz. Means all value must be divided by max gain(i.e. st 0 hz).

[Ameer Hamza]

If you divide by max value than the gain will be 1 at 0Hz. I think you can just subtract the value of the signal at 0Hz.