Walter Roberson
43,055 total contributions 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.
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The contributor whose answers received the most acceptances in 2018
Awarded to Walter Roberson on 18 Jan 2019
The contributor whose answers received the most acceptances in 2017
Awarded to Walter Roberson on 02 Jan 2018
Contribute at least one answer each month for 36 consecutive months
Awarded to Walter Roberson on 20 Jul 2017
The contributor whose answers received the most acceptances in 2016
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The contributor whose answers received the most acceptances in 2015
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The contributor whose answers received the most acceptances in 2011
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The contributor whose answers received the most acceptances in 2012
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Answer 50 questions that were unanswered for more than 30 days
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100 of your answers have been accepted
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Solve a problem for the first time
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"Undefined function or variable 'imsplit'."
<https://www.mathworks.com/help/images/ref/imsplit.html> Requires R2018b You should be using the "doc" function in your MA...
22 hours ago | 0
MATLAB Active Contour Open Source Code
https://www.mathworks.com/matlabcentral/fileexchange/19567-active-contour-segmentation
24 hours ago | 0
Is there anyway to load 2011b to Win 10?
Yes. I have done it in the past. It is not supported, and you can expect there could be problems with serial ports, parallel por...
24 hours ago | 0
How do I create a session that is limited by time
I have only found four ways in MATLAB to force a function to end without its cooperation: # Java robot class to send control ...
1 day ago | 1
In what order the transfer of functions take place in Fmincon?
fmincon is invoked first and controls all the other calls. The initial value will never be used if it does not fit within the...
1 day ago | 0
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Stop uitable from appending to cell when you type
Use the uitable cell selection callback. When the callback fires, look at the position indicated in the event data, and set that...
1 day ago | 0
Error in imabsdiff of two images
You are trying to take the image difference between file *names*. You need to read in the files and compare the contents.
1 day ago | 1
output of k means clusters "idx"
idx will be a vector which has as many entries as there are rows in X. The j'th entry, idx(j) tells you the cluster number that...
1 day ago | 0
How do I setup ROI once and it will apply to all other images?
imageFolder = dir('C:\Users\85042513\MATLAB\Projects\BAT CVE\Images\OK\*.jpg'); numfiles = length(imageFolder); ori_roi = cell...
1 day ago | 0
Data import from csv file
These days we recommend readtable() -- or if you have R2019a or later and your data is entirely numeric, then possibly readmatri...
2 days ago | 0
solve a system of equations symbolically with R2018a
You are using R2018b or later. solve() no longer accepts character vectors for equations. Furthermore, each of your equations h...
2 days ago | 0
Issue Saving image with text overlay to png
I recommend you take a different approach. Instead of plotting on the image and text() on the image, use the Computer Vision ins...
2 days ago | 0
How can I get the index numbers of cells that form a specific string?
This is an algorithm question rather than a MATLAB question, really. Start with an empty cell array of leading substrings, and ...
2 days ago | 0
convert from datetimes to double
datenum() the datetime object. This is not preferred. Consider using a table object or better yet a timetable
2 days ago | 0
M-script error while run it
You ask to sim() project3test . However if you look carefully at the first of your two images you will see that your real model ...
2 days ago | 1
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Index exceeds the number of array elements (1).
You only assign to t(n) when n is 1, so t(1) exists but no other t location. You then increase n to 2 and expect t(2) to exist. ...
2 days ago | 1
dealing with negative indices error
for T = 1 t = -1:1 end After that T is the scalar 1 and t is -1 0 1 F = X_temp + (((delta*eta)/(beta*r))*(1-exp(r...
2 days ago | 0
Error using function. I get the error Array indices must be positive integers or logical values.
You have V(1,1) and you assign that to V_fun{1}. We do not know the datatype of V but we do know that indexing with () can never...
2 days ago | 0
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When reading an image, why is the map value blank?
This is common. RGB images are r x c x 3 with an empty map CMYK images (tiff only) are r x c x 4 with an empty map RGBA...
2 days ago | 1
| accepted
how to generate a function using symbolic expression and plot that
Replace syms gamma With gamma = sym('gamma');
2 days ago | 0
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Getting out of while loop when user says end
With r2017a or later you can also use answer == "Yes"
2 days ago | 0
number format using solve
Why not? Those are the answers to the question you are asking of MATLAB. If you put them back through the equations, you will fi...
2 days ago | 0
Finding the Probability of a Sequence of Numbers
A= [10 13 10 1 111 102 10 13 7 10 112 100 14 116 102 10 14 120]; Ac = A.'; ...
2 days ago | 0
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Index exceeds the number of array elements (1). Caused by: Failure in initial nonlinear constraint function evaluation. FMINCON cannot continue.
constraint2 will be called with a vector the same size as the vector passed to the objective function. Your x0 in your fmincon c...
2 days ago | 0
| accepted
I get an error stating "Not enough input arguments. Error in constraint2 (line 3) c(1)=x(n+6)-x(n+7);". Please Help
constraint2 will be called with a vector the same size as the vector passed to the objective function. Your x0 in your fmincon c...
2 days ago | 0
Index in position 1 exceeds array bounds (must not exceed 1).
Give the command dbstop if error and run the code. If the place it stops is not a try/catch or error() call, then you have fou...
2 days ago | 1
real and imaginary part of complex number
V = complex(randi([-10 10],1), randi([-10 10])); %some data to work on syms n real Vn = V^(1/n); RV = rewrite( real(Vn),...
2 days ago | 2
| accepted
Write Data to Excel
T = table(cellstr(var).', val.'); writetable(T, filename, 'Sheet', 1, 'Range', 'A1', 'writevariablenames', false)
2 days ago | 0
Fraction in label of a scatter plot
h = gobjects(1,2); h(1) = scatter(Base(:,1), Base(:,2), 30, 'b', 's', 'LineWidth', 2, 'DisplayName',' $\frac{X}{Y}$'); hold ...
2 days ago | 0
| accepted
Warning: The DrawMode property will be removed in a future release. Use the SortMethod property instead. > In SixDofAnimation (line ...)
https://blogs.mathworks.com/graphics/2014/11/04/sortmethod/ https://www.mathworks.com/matlabcentral/answers/100094-what-determ...
2 days ago | 1
| accepted
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