2D PEAK FINDER

11 次查看（过去 30 天）
raj
raj 2012-3-22
Hello , I have a very large matrix of 900x500 which i gained from applying a spectrogram. what i want is to find the local maxima for every row and plot those values.A threshold value is initialized for reference as peaks above this values are plotted. Actually what i did earlier was using the max(A(the matrix)- threshold,0) but the result obtained by this and by adjusting the colorbar of my spectrogram gives me the same result . I want to know is my idea of peakfinding correct? or can u suggest me the correct method of finding the peaks above a threshold .
  1 个评论
raj
raj 2012-3-22
hmmm just now got some clarity how can i plot only the peaks any idea??

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Geoff
Geoff 2012-3-22
Howdy, if you only want to plot the peaks (with their original values)
B = A;
B(B <= threshold) = NaN;
plot(B'); % Transposed to treat rows of B as individual series
By setting any non-required value to NaN, you make the line non-continuous. If you have only a single value above the threshold at one time, it will be difficult to see unless you use markers on your plot:
plot(B', '.-');
  2 个评论
raj
raj 2012-3-22
How can I plot the peaks using markers on a 2D plot??? It is almost like a surf plot or imagesc plot but only with marking of the different peak values
raj
raj 2012-3-22
if i plot using an imagesc command I almost get the results as a spectrogram which represents the same results of a spectrogram with change in color bar scale . Is it the right way of representing the peak finder results

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Descriptive Statistics 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by