how to detect and measure Gaussian peaks ?

filename='14 - sampleMap.xlsx';
[num,txt,raw] = xlsread(filename);
[nx,ny] = size(num) ;
[X,Y] = meshgrid(1:nx,1:ny) ;
% pcolor(X,Y,num)
% mesh(X,Y,num) ;

% shading interp 
a=findpeaks(X,Y)

[Walter Roberson]

Please do not close questions that have an answer

Answer 1

[Ameer Hamza]

To find peaks in a 3D mesh you can use imregionalmax(). In your case

locationMax = find(imregionalmax(num));
maxValue = num(locationMax);

[khushboo chhikara]

and how to plot it ?

[Ameer Hamza]

surf(x,y,z);
hold on
plot3(x(locationMax), y(locationMax), z(locationMax), 'r+', 'MarkerSize', 15, 'LineWidth', 10)

[khushboo chhikara]

filename='14 - sampleMap.xlsx';
[num,txt,raw] = xlsread(filename);
[nx,ny] = size(num) ;
[X,Y] = meshgrid(1:nx,1:ny) ;
% pcolor(X,Y,num)
% mesh(X,Y,num) ;
% shading interp 
% a=findpeaks(X,Y)
locationMax = find(imregionalmax(num));
maxValue = num(locationMax);
surf(x,y,z);
hold on
plot3(x(locationMax), y(locationMax), z(locationMax), 'r+', 'MarkerSize', 15, 'LineWidth', 10)

| can we do this in 2-D for whole data after reading the excel file??|

[Ameer Hamza]

What do you mean by 2D? This code will read excel file and make a surf plot. And draw a marker at the maximum point.

[khushboo chhikara]

i want that this code will read the excel file and than detect amd measure gausian peaks and plot them in 2D.

[Ameer Hamza]

Are you looking for something like this

figure
contourf(x,y,z, 30);
hold on
plot(x(locationMax), y(locationMax), 'r+', 'MarkerSize', 15, 'LineWidth', 10)

[khushboo chhikara]

https://terpconnect.umd.edu/~toh/spectrum/PeakFindingandMeasurement.htm

this but using excel sheet.

[Ameer Hamza]

The link you shared contain 1D signal. Your excel file contains 2D signal. These are two different types of signal.

[khushboo chhikara]

yes ! i want these kind off peaks for my data.

[Ameer Hamza]

Your data set is 2D. Can you show an example, where 2D dataset is used to make such plot?

[khushboo chhikara]

No ! thats why i am asking for help ? Is it possible to do it in 2D ?

[Ameer Hamza]

Watching your excel sheet, it appears that the best way to show the data is through drawing a surface plot over a mesh.

[Ameer Hamza]

@khushboo's answer moved here

"Ok .. means the coding done so far is correct ?"

If the graphs look fine for your purpose, it is correct.