# Ridwan Alam

**Statistics**

RANK**194**

of 242,866

REPUTATION**382**

CONTRIBUTIONS

**0** Questions

**128** Answers

ANSWER ACCEPTANCE **
0.00%
**

VOTES RECEIVED**32**

RANK**14,300** of 16,985

REPUTATION**6**

AVERAGE RATING**0.00**

CONTRIBUTIONS**1** File

DOWNLOADS **6**

ALL TIME DOWNLOADS**67**

CONTRIBUTIONS**0 Posts**

CONTRIBUTIONS**0** Public Channels

AVERAGE RATING

CONTRIBUTIONS**0** Highlights

AVERAGE NO. OF LIKES

**Content Feed**

Time Series Forecasting Using Deep Learning (LSTM)

Yes. Please follow the examples here: https://www.mathworks.com/help/deeplearning/ref/nnet.cnn.layer.sequenceinputlayer.html h...

1 year ago | 0

Perform FFT from imported excel data. Help please

Signal = D(:,2); RD = str2double(R) is making a matrix of NaNs. So, you can use D instead of R.

1 year ago | 0

find a set of data in an array

idx = find(A~=0); B = A(idx); idx and B have the same size and order. I believe this is what you are looking for?

1 year ago | 0

How can I select rows in an array based on the values in the first column of another array?

new_array = second_array(first_array,:)

1 year ago | 1

| accepted

adding different number of columns to specific row

Try using the table join() method: https://www.mathworks.com/help/matlab/ref/table.join.html Example: M_obs = readtable('book...

1 year ago | 0

How to display all values of an iteration?

for i = 1:100 xc = (x1 + x2)/2; if f(x1)*f(xc)<0 x2 = xc; else x1 = xc; end disp(['x1...

1 year ago | 0

| accepted

How to replace a rectangle with another rectangle?

I tried this, it worked for me: r = rectangle('FaceColor', [0.2 0.2 0.7]); r.FaceColor = [0.2 0.2 0.2];

1 year ago | 0

Changing array size of user input data

myCell = {}; k = 0; for i = 1:5:number k = k + 1; myCell{k,1} = i:min(i+4,number); end writecell(myCell,fullfile(...

1 year ago | 0

| accepted

Problem with function handle for Basis function in fitrgp

load(fullfile(matlabroot,'examples','stats','gprdata2.mat')) In this case, your x is n x 1; hfcn returns H, which has size n ...

1 year ago | 0

| accepted

Errors using function and fsolve

% *Set universal constants:* global surr sink sigma sigma = 5.67e-8; % Stefan-Boltzmann constant (in W/m^2/K^4) % % *S...

1 year ago | 0

Linear regression outputs (regstat function)

The first one is for the constant coefficient (aka intercept term). I believe you have only one predictor x, then your model is...

1 year ago | 0

| accepted

T-wave on ECG

If I understood right what you are asking, you need to find the peaks for P,Q,R,S, and T using findpeaks(). https://www.mathwo...

1 year ago | 0

making dataset 3D data function

Let's assume your variables are named as 'input01', 'input02', ... 'input48'. my3Ddata = []; myMeanData = []; varnames = wh...

1 year ago | 0

| accepted

How can I save a image from imshow into a cell array ?

I don't think you need the imshow(). imshow() is only used to show the image, and it returns an image object, which is not norma...

1 year ago | 0

| accepted

Piecewise function of y

It's a bit hard to understand the issue here. Please let me know if this is not what you are looking for: plot(C2(20:90), heigh...

1 year ago | 0

| accepted

Replacing NaN with blanks in a matrix

I believe you are looking for fillmissing() or rmmissing(): https://www.mathworks.com/help/matlab/ref/fillmissing.html https:/...

1 year ago | 0

linear regression of time series with time index

If you have a fixed equation like the one provided, I believe you are looking for parameter estimation methods to find beta_0, b...

1 year ago | 0

please explain the solution

K = round(Tuq'*eye(5)*Tuq,2); M = [ m 0 0 ; 0 m 0 ; 0 0 I ]; eq = det(K*k-w1*M); s = solve(eq,w1); will prevent sym() to con...

1 year ago | 0

| accepted

FFT filter on voice file help please

There are multiple ways you can filter these data. You can use bandpass, high or low pass filters, or any other specific filters...

1 year ago | 0

Fourier Transform in Simulink

Change the Samples per frame property on the Sine Wave block: https://www.mathworks.com/help/dsp/ug/transform-time-domain-d...

1 year ago | 0

Digital signal processing LINEAR AND CIRCULAR CONVOLUTION length-N sequences error

x = [2+3j 3-1j -1+2j 3j 2+4j]; https://www.mathworks.com/help/matlab/ref/j.html

1 year ago | 0

| accepted

How to detect variations in data?

Depends on how complex of a solution you are looking for. There are algorithms for change point detection that you can try. htt...

1 year ago | 1

Which Right Eigenvector to report?

I assume you meant 'right' as opposed to 'left' eigen vectors. [V,D] = eig(A); % to get left eigenvectors, [V,D,W] = eig(A), he...

1 year ago | 0

Creating a table for the "For-loop command" results:

Even though there are many more efficient ways to do this, this is a simple addition to your code: clear clc n=input('Enter t...

1 year ago | 0

How to extract sub-matrices from a big matrix?

% to find the matched date and store the that day along with the following 5 days (120 hours) in another matrix. for n = 1:siz...

1 year ago | 1

| accepted

How to change nonzero values to 1 within a table?

tempTable = table2array(myTable); tempTable(tempTable~=0)=1; myTable = array2table(tempTable);

2 years ago | 0

| accepted

Replace NaN's in a table - I need some help

T2.col1(ismissing(T2.col1)) = "Behezad"; T2.col2(ismissing(T2.col2)) = "RAD"; T2.col3(ismissing(T2.col3)) = "MORD";

2 years ago | 1

Adding values of Columns in a matrix to create another matrix (for loop)

dim=size(E_min,2); % dim = 25 fun = @(E) A*exp(-E/kT); Np = []; nyi = []; for i = 1:dim Np(i)=integral...

2 years ago | 1

| accepted

How to mark a specific point on CDF graph?

Assuming you have 4 cdf arrays, you can find the x-values as: cdf1ind = find(cdf1>=.80,1,'first'); x1 = x(cdf1ind); cdf2ind = ...

2 years ago | 0

| accepted

How to write a code to estimate parity of numbers in a sequence?

bnumbers = [5 0 8 3 9 2 7 6 1 4 8 1 0 5 9 7 2 6 3 4]'; bresponse = [0 0 1 0 0 0 0 0 0 2 0 2 2 0 0 0 0 0 0 0]'; bbinary = ...

2 years ago | 0

| accepted