MATLAB: How to code this? Resampling of vector

samplingvector

Hi all,

Currently I am trying to resample a signal by changing its signal frequency; The signal is given by time vector t and signal vector s. Example:

t=[ 1 2 3 4 5 6 7 8 9 10 11 12]

s=[3 3.5 3 5.5 2 2.5 3 5 7 2.5 3.5 4 ]

I want to create a vector s_new in which the sum of the values of s on the interval <0,4] is one element, the sum of interval <4,8] is an element etc, creating:

s_new= [15 12.5 17]

I have been toying around with histc but didnt succeed. Any ideas on coding this?

Thanks in advance! Lucas

Best Answer

For these straightforward time values, this will do

sum(reshape(s,4,3))

If t gets more complex you should be able to find a similar solution, though.

Related Solutions

MATLAB: Sum columns of matrix

>> M = [1,5,2,4,3,2;2,3,1,4,4,1;4,5,2,2,3,1]
M =
   1   5   2   4   3   2
   2   3   1   4   4   1
   4   5   2   2   3   1
>> M(:,1:2:end) + M(:,2:2:end)
ans =
   6   6   5
   5   5   5
   9   4   4
>> reshape(sum(reshape(M.',2,[]),1),[],3).'
ans =
   6   6   5
   5   5   5
   9   4   4

And

>> M = [2,1,2,1,1,5,5,4,4,2,4,5;3,5,1,3,1,2,5,3,3,4,5,4;2,4,2,1,5,5,4,3,2,2,1,5]
M =
   2   1   2   1   1   5   5   4   4   2   4   5
   3   5   1   3   1   2   5   3   3   4   5   4
   2   4   2   1   5   5   4   3   2   2   1   5
>> reshape(sum(reshape(M.',3,[]),1),[],3).'
ans =
    5    7   13   11
    9    6   11   13
    8   11    9    8

MATLAB: For loop, if loop, while loop or combination

 Refer to the following code on how to do this:

det_rate = [0.3, 0.2, 0.5, 0.1];
T = 8;             % T is total searching time
delta = 0.5;       % take delta from one value of t_start and add it to another value
a= 0;
b=0;
c=0;
d=0;
number_of_iterations = T/delta;
max_B = 0;
P = zeros(length(t),4);
s = zeros(length(t),1);
for i= 1:number_of_iterations
    for j = 1:number_of_iterations
        for k = 1:number_of_iterations
            for l=1:number_of_iterations
                d = T - (a+b+c);
                if(d>0)
                    result = 1-exp(-1.*det_rate.*t(i,:));
                    if(sum(result) > max_B)
                        max_B = sum(result);
                    end
                end
            end
            c = c+delta;
        end
       b = b+delta;
    end
    a = a+delta;
end

Refer to this documentation page to see how for loop works, here.

Best Answer

Related Solutions

MATLAB: Sum columns of matrix

MATLAB: For loop, if loop, while loop or combination

Related Question