How can I find the the starting point of A array and calculate average starting from starting points to 1 second
A=[0 0 0 0 0 -0.01 -0.2 0.3 0.4 0.5 0 0 0 0 0 0 0.01 0.02 0.03 0.04 0.1 0.2 0.3 0.4 0.7 0.8 1 1.2 1.3 1.4 1.5]
Time=[0 0.1 .2 .3 .4 .5 .6 .7 .8 .9 1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.8 3 3.1]
By removing the noise the starting point should be A(17) which is equal to 0.01
Then calculate average of A starting from starting point after 1 seconds
Code is self explanatory
A=[0 0 0 0 0 -0.01 -0.2 0.3 0.4 0.5 0 0 0 0 0 0 0.01 0.02 0.03 0.04 0.1 0.2 0.3 0.4 0.7 0.8 1 1.2 1.3 1.4 1.5] ;
Time=[0 0.1 .2 .3 .4 .5 .6 .7 .8 .9 1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.8 3 3.1];
%make negative values zero
A(A<0)=0;
%get non negative values position and add padding
mask=[0,A>0,0];
%get starting points
startingPoints =strfind(mask,[0 1]);
%get length of continuous values from starting points
temp =diff(find(~mask))-1;
length = temp(temp>0);
%get the index of largest length
[~,index]=max(length);
%get starting point
dataStartingIndex = startingPoints(index)
%starting point value
A(dataStartingIndex)
%get ending point after 1 seconds
dataEndingIndex=find((Time(dataStartingIndex)+1)==Time);
%find average
avg=mean(A(dataStartingIndex:dataEndingIndex))
This really depends on your data. It is a bit unclear but in your example it seems that noise can exceed your 'information value'. So you can't detect it just with a threshold.
Maybe get the position where A is always superior to something like 0.01 :
startpos= (A>0).argmax()
truedata=A[startpos:]
time=T[startpos:]
you can calculate average with the method .mean()
Related
I am new to MATLAB and I need help. I have 3 matrices (A, B, and C) and I want to create a new matrix average_ABC that contains average values.
A = [ 0.3 0.5 0.9
0.14 0.36 0.1
0.9 0.5 0.14]
B = [ 0.8 0.9 0.14
0.1 0.25 0.4
0.8 0.14 0.25]
C = [0.25 0.3 0.47
0.12 0.3 0.2
0.14 0.56 0.9]
The resulting matrix will be
average_matrix = [ 0.3 0.5 0.47
0.12 0.25 0.2
0.8 0.5 0.25]
Please, any suggestion, how can I do it?
You can first concatenate your matrices along the third dimension (using cat) and then compute whatever you want using the dim parameter that is available for most functions to specify that you want to perform that operation along the third dimension.
Also you've stated that you want the average (mean), but based on your example you actually want the median. Either way, we can compute them using this method.
data = cat(3, A, B, C);
% Compute the mean
mean(data, 3)
% 0.45 0.56667 0.50333
% 0.12 0.30333 0.23333
% 0.61333 0.4 0.43
% Compute the median (which seems to be what you actually want)
median(data, 3)
% 0.3 0.5 0.47
% 0.12 0.3 0.2
% 0.8 0.5 0.25
I hope this will work
average_matrix=(A+B+C)/3.;
I am trying to make a program in matlab to get this numbers:
0 1 0
0 0.8 0.2
0 0.6 0.4
0 0.4 0.6
0 0.2 0.8
0 0 1
0.1 0.9 0
0.1 0.7 0.2
0.1 0.5 0.4
0.1 0.3 0.6
0.1 0.1 0.8
0.1 0 0.9
and so on but I cant make the program to reduce the values of the second and third column when the first column increases. This is my code. Thanks
lai=0:0.1:1;
laj=1:-0.2:0;
lat=0:0.2:1;
for i=1,length(lai)
for j=1,i
for t=1,j
j
lam1(1,:)=lai;
lam2(1,:)=laj;
lam3(1,:)=lat;
end
end
end
Try this and do some thinking for what you require.
for i=0:0.1:0.1
for j=0:0.2:1
disp([i,j,1-j])
end
end
I would like to only show these x-values on the x-axes
xx=[0.0005 0.005 0.05 0.1 0.25 0.5 0.75 1 1.25 1.5];
Is it possible?
You can modify axis labels using XtTickLabel property. For example:
set(gca,'XTickLabel',[0.0005 0.005 0.05 0.1 0.25 0.5 0.75 1 1.25 1.5])
This will change only labels, not actual values on the plot. To check values as well you can use:
set(gca,'XTick',[0.0005 0.005 0.05 0.1 0.25 0.5 0.75 1 1.25 1.5]);
set(gca,'XScale','log'); % Your xx values seem to be logarithmic, so this can help.
I want to plot a bar chart in Matlab with (1) log-scale for x-axis and (2)bars in same width. But with the code below, the width of the bars are different. Can any one help? Many thanks！
xdata = [0.01 0.018 0.032 0.056 0.1 0.18 0.32 0.56 1 1.8 3.2 5.6 10];
ydata = [1.3 1.6 1.5 1.2 1.0 3.5 0.6 3.1 1.6 1.9 1.7 0.3 0.4];
bar(xdata,ydata);
set(gca,'XScale','log');
Instead of plotting xdata on a log scale, plot the log of xdata on a linear scale. Then modify labels to reflect the linear value (not the used log value).
xdata = [0.01 0.018 0.032 0.056 0.1 0.18 0.32 0.56 1 1.8 3.2 5.6 10];
ydata = [1.3 1.6 1.5 1.2 1.0 3.5 0.6 3.1 1.6 1.9 1.7 0.3 0.4];
bar(log10(xdata),ydata);
set(gca,'Xtick',-3:1); %// adjust manually; values in log scale
set(gca,'Xticklabel',10.^get(gca,'Xtick')); %// use labels with linear values
How do I draw a sequence of frames of a network with the help of a transition matrix?
I have a matrix that denotes a graph. The matrix changes with iterations. Can anyone give me an insight of what functions I can use to create the series of the network?
original=[0.06 0.57 0.37 0 0;
0.57 0.06 0.37 0 0;
0.37 0.57 0.03 0.03 0;
0 0 0.03 0.13 0.84;
0 0 0 0.84 0.16];
Suppose the, above is the matrix in question. Then the graph should be
This question is related to this earlier query and this one. But here's an answer specific to your situation.
Given a weighted adjacency matrix:
original = [0.06 0.57 0.37 0 0;
0.57 0.06 0.37 0 0;
0.37 0.57 0.03 0.03 0;
0 0 0.03 0.13 0.84;
0 0 0 0.84 0.16];
you can first define the number of nodes in the network:
N = size(original,1);
and then a corresponding set of coordinates on the perimeter of a circle:
coords = [cos(2*pi*(1:N)/N); sin(2*pi*(1:N)/N)]';
Then you can plot the graph using gplot:
gplot(original, coords)
and mark the vertices using text:
text(coords(:,1) - 0.1, coords(:,2) + 0.1, num2str((1:N)'), 'FontSize', 14)
Note that the gplot function does not weight the lines by connection strength; the matrix element (i,j) is treated as binary, indicating absence or presence of a link between nodes i and j.