Question

MATLAB

This is a copy and paste of what we need to do. Enter this in MATLAB. Please explain what you are doing and why. I don't just want the answer. I want to study this. This is a 100 class and the teacher teaches it as if we are 300 students....

please help me learn not just get the answer

% q11_sol.m % % Quiz #11 solutions % February 11, 2020 % %% Part 1 % For the given vector % V = [ 6 1 7 4 9 5 8 3 10 2 ] % Create vector V1 by dividing % all even members with 2. % What is the sum of V1? v=[6 1 7 4 9 5 8 3 10 2]; % create vector % initialize new vector v1=v; % select only even elements sel=2:2:length(v); % from 2, every other, until the end of the vector % divide even members by 2 % you can use for loop or select only even elements v1(sel)=v1(sel)/2; % divide only selected elements sum(v1) % ans = % % 47.5000 %% Part 2 % load vector x load rsig.mat % MAT file with original signal % initialize variables N=length(x); % length of the vector with samples % Processing - find maximums dp=[0 diff(x)]; % differences % find maximums j=0; % index of array of results for i=2:N % for each sample % (start from the second since we find differences and index must be >0) if (dp(i-1)>0) & (dp(i)<0) % did I find local maximum? j=j+1; % update my result index it(j)=i-1; % save index of the previous sample as local maximum end end % I now have all local maximums, their indices are in vector it % and their values are x(it). % How many peaks have amplitude greater than 0.55? sum(x(it)>0.55) % ans = % % 52

Answer 1

`Hey,

Note: Brother if you have any queries related the answer please do comment. I would be very happy to resolve all your queries.

PART 1

V = [ 6 1 7 4 9 5 8 3 10 2 ]; define a vector V given by your prof

V1=V; Basically assigns the same vector to another variable named v1

sel=2:2:length(V); it is basically consisting of all elements from 2 to length of V with 2 spacing. So, for example it will be [2,4,6,8,10] if the length is 10 or 11

V1(sel) basically fetches all elements from V1 which have index in sel So, for example

V1([2,4,6,8,10]) will have elements at index2,4,6,8,10 in V1

So,

V1(sel)=V1(sel)/2 means that divide all elements at that index by 2 which means at even index

Now V1 is edited according to output needed

Note: Brother According to Chegg's policy we are only allowed to answer first part if there are many. So, I request you to post other part as separate posts.

Kindly revert for any queries

Thanks.