Community Profile

photo

Walter Roberson


Last seen: Today Active since 2011

I do not do free private consulting. If you want to bring my attention to something, send a link to the MATLAB Answers location. I am currently caught up to T0099119; if you are waiting on a reply from me for an older issue, please send me a reminder.

Programming Languages:
C, MATLAB, Shell, Perl, Fortran
Spoken Languages:
English

Statistics

All
  • Most Accepted 2021
  • Roberson Cup
  • Solver
  • First Review
  • Most Accepted 2019
  • Most Accepted 2018
  • Most Accepted 2017
  • 36 Month Streak
  • Most Accepted 2016
  • Most Accepted 2015
  • Most Accepted 2011
  • Most Accepted 2012

View badges

Content Feed

View by

Answered
Vectors must be the same length.
Is it possible that you ran this code twice with more theta values the first time? You are not preallocating R so if you ran mul...

20 minutes ago | 0

Answered
How can i read files inside a folder?
foldername = 'SnowCoverJuly2000'; dinfo = dir( fullfile(foldername, '*.dat') ); dinfo(5:end) = []; %only want first 4 nfiles...

3 hours ago | 0

Answered
currency recognition using image Processing Techniques in matlab
You seem to be using https://www.mathworks.com/matlabcentral/fileexchange/47143-currency-recognition which does not define a dis...

3 hours ago | 0

Answered
How can I generate a comma separated list from the MATLAB vector s = [1, 2, 3, 4]?
s = 1:4; ExpandCell = @(C) C{:}; [A,B,C,D] = ExpandCell(num2cell(s))

7 hours ago | 0

Answered
code does not seem to work but is not giving any errors
a1(i,j)= (red(i-1,j-1)+red(i-1,j)+red(i-1,j+1)+red(i,j-1)+red(i,j)+red(i,j+1)+... red(i+1,j-1)+red(i+1,j)+r...

7 hours ago | 0

| accepted

Answered
I want to only interpolate shorter amounts of data and leave the longer amounts of NaN not interpolated.
max_length_to_interpolate = 17; %change as appropriate nanp = isnan(data(:).'); %must have row vector starts = strfind([f...

8 hours ago | 0

Answered
Not enough input arguments. And there is an error in "N = length(N_func);"
You cannot run that code just by clicking on the green Run button. You need to go down to the command line and invoke the code p...

9 hours ago | 0

Answered
How do i retrieve data from a vector of idexes?
Reachnext is a vector that contains the indexes of certain files i want Then Reachnext contains numeric values? But your code u...

10 hours ago | 0

Answered
how to plot exel data by loop
filename = 'TheFile.xlsx'; T = readtable(filename); [G, uids] = findgroups(T{:,6}); hold on h = splitapply(@(X,Y) plot(X, ...

10 hours ago | 0

Answered
I am confused about my code, can you guys please help me to tell me what SVM did I use?
One vs One when you use fitcecoc

23 hours ago | 0

| accepted

Answered
reading trivially sorted images 1 by 1 in loop
imgdir = 'C:\Users\Nikhil\Desktop\Manu Gowda\images'; Then in the loop, basename = sprintf('1mm%04d.jpg', i); im = imread(ful...

1 day ago | 0

| accepted

Answered
How to fully utilize my CPU and GPU for running my code?
When you use 'UseGPU', true then autoencoder trains only on the GPU, with the CPU being used only to manage the training. You c...

1 day ago | 0

Answered
How to add 'Tone' on digital pin of Arduino Uno?
Tone was not supported until R2019a... the version immediately after the one you are using.

1 day ago | 0

Answered
I am currently trying the quadcopter project, and I am getting errors in estimatorVars.
There was nothing that said what kind of error it was? Like "file not found" or "out of memory" or wrong datatype or index out o...

1 day ago | 1

| accepted

Answered
Read text file with multiple delimiters in a single row
Your timestamps are too low precision for it to be reasonable that you stop at milliseconds -- you have too many values that are...

1 day ago | 0

| accepted

Answered
Creating a table using cell arrays
Results = {randi(9, 11, 1); "R"+randi(9,11,1)} Groups = cellstr(('a':'k').') Table = table(Results{:}, 'RowNames', Groups)

1 day ago | 0

| accepted

Answered
how to convert complex number into double number?
siz=256; x=nan(1,siz+1); %<------------PREALLOCATE!!! y=nan(1,siz+1); %<------------PREALLOCATE!!! Z=0.78;% initial value of ...

2 days ago | 0

Answered
Unable to import txt file
train = fullfile(dataFolder, "train_FD001.txt"); [train_data1, train_labels1] = importdata(train)

2 days ago | 0

| accepted

Answered
keeping the variable names same
MATLAB uses Name/Value pairs in which the first element of the pair tells the option name and the second element of the pair ind...

2 days ago | 0

| accepted

Answered
remove grid lines completely
filename = 'something.fig'; fig = openfig(filename); ax = findobj(fig, 'type', 'axes'); set(ax, 'XGrid', 'off', 'YGrid', 'off...

2 days ago | 1

| accepted

Answered
Detection of pixels in image that are not in focus
"blur" is perceived when there is a loss of detail -- corresponding to loss of high frequency information. If you do a low pas...

2 days ago | 0

| accepted

Answered
run the program in matlab
T3=1e-9:1e-9:1e-6; for i=1:numel(T3) t3=T3(i); [b]=fminsearch(@(b) abs(trial0(complex(b(1),b(2)), t3)) ,[1,1]); ...

2 days ago | 0

Answered
How to convert the following UTC to serial date number?
format long g utc_t = '2018-345T02:19:02.175Z' utc_dt = datetime(utc_t, 'InputFormat', "uuuu-DDD'T'HH:mm:ss.SSS'Z'") time = d...

2 days ago | 1

| accepted

Answered
extract data from cell array
c{1,1}.name = 'Tom'; c{1,1}.age = 48; c{2,1}.name = 'Bob'; c{2,1}.age = 24; c{3,1}.name = 'Jim'; c{3,1}.age = 12; vec_age = c...

2 days ago | 0

| accepted

Answered
Searching word list for key letters
wordList = {'apples' 'orange' 'banana'}; ContainList = 'shu'; NotContainList = 'br'; mask1 = contains(wordList, num...

2 days ago | 0

Answered
How to find index of continous non-NaN values?
mask = ~isnan(Sal(:).'); %row vector needed starts = strfind([false mask], [false true]); stops = strfind([mask false], [true...

2 days ago | 0

Answered
Subs does not do the job
e=sym('e',[J 1]); e would be a vector containing symbols named e1 e2 e3 A=replace(A,'w','e(1)'); That e(1) will not be t...

3 days ago | 0

| accepted

Answered
How can I use conv() in a function handle and keep original vector size, but not use 'same'/'valid'?
a = [1,2,3] b = [1,2,3,4,5,6] FirstN = @(V,N) V(1:N) c = @(x) FirstN(conv(a,b(x(1))), numel(a)) However... you are using x(1...

3 days ago | 0

| accepted

Answered
Substitute variables in function handle
What you have already done should work. Although all of the function handles will look the same, they would have captured diffe...

3 days ago | 0

Answered
how can i know the programming behind a MATLAB GUI
I can tell from the list of files that what you have is a compiled executable built by MATLAB Compiler. You are not intended to ...

3 days ago | 0

| accepted

Load more