Walter Roberson
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48 603 total contributions since 2011I 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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Solve a problem for the first time
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The contributor whose answers received the most acceptances in 2017
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Contribute at least one answer each month for 36 consecutive months
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The contributor whose answers received the most acceptances in 2016
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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 2013
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Accept 50 answers given by other contributors
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Reach 25000 reputation points
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Answer 50 questions that were unanswered for more than 30 days
Awarded to Walter Roberson on 20 Jul 2017
All possible combinations of a number of an array
a = [ 1 2 3]; ua = unique(a); nua = length(ua); assert(nua <= 36, 'Sorry, this code only supports up to 36 elements in...
environ 11 heures ago | 0
| accepted
How to deleted Enter char
a = regexprep(a, '[\r\n]', '') or a(ismember(a, [10 13])) = ''; %10 is newline, 13 is carriage return
environ 12 heures ago | 0
What is the problem for the following code?
h = input('\nEnter step size (h) = ') x(1) = input('\nx0 = '); You need a comma or a semi-colon between those two commands. Be...
environ 12 heures ago | 0
'deal' doesn't distribute the elements of a calculated array out of cellfun
deal has never done that for any kind of variable. You are calculating a single vector in the cellfun, so your code with deal()...
environ 13 heures ago | 0
How to drop small terms in symbolic expression?
I was sure that I had posted code for this at one point, but I cannot find it. threshold = 1e-10; syms A E I R M = (sym('3.7e...
environ 13 heures ago | 0
Index in position 1 exceeds array bounds (must not exceed 1) -- cannot fix behavior script
When you load() and assign the output to a variable, the result is a struct with one field for each variable loaded. clickstr =...
environ 14 heures ago | 0
How do I reference a previous cell in a table?
fillmissing(YourTable, 'previous')
environ 14 heures ago | 0
Error: Index exceeds the number of array elements (0) on the linspace function
ftime3=linspace(Uhrzeit(1),Uhrzeit(end),height(freqbereich3)); If Uhrzeit is empty then Uhrzeit(1) would be out of ...
environ 14 heures ago | 0
Removing specific cell values from a table
I was wondering if there was any way I could just mark those empty cells as unnecessary for doing the calculation? No, you cann...
environ 15 heures ago | 0
How to make weekdays axis?
ax2.XAxis.TickLabelFormat = 'eee'; %or 'eeee'
environ 16 heures ago | 0
How to change axis size without affecting bin size
[Zf_S, Zf_L] = cellfun(@(B) bounds(B, 'all'), Zf); Zf_max = max(Zf_L); Zf_min = min(Zf_S); Zf_vals = linspace(Zf_min, Zf_max,...
environ 16 heures ago | 0
How to spearate the output of vl_hog() into 6*6*31 blocks and use reshape() to convert every block to a row vector?
If you have a cell array of blocks, then vector_blocks_cell = cellfun(@(B) reshape(B,1,[]), non_vector_blocks_cell, 'uniform', ...
environ 16 heures ago | 0
How do I keep the number of bins used the same when generating a histogram along with how do I illustrate its depth with color?
You are keeping the number of bins the same for the two histograms. The bins just are not aligned between the two plots, and you...
environ 16 heures ago | 0
Convert state-space representation (MIMO) to transfer function matrix
https://www.mathworks.com/help/matlab/ref/ss2tf.html But if you have an existing ss system created with https://www.mathworks....
environ 20 heures ago | 0
computer shut down when run
You have a script that calls @myfunc1 . And then you have function main and inside that function you have function myfunc...
environ 20 heures ago | 0
i am geting error in this line why Error: File: dfdddd.m Line: 32 Column: 89 Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.
t_ind1(ii) =(3 * v_th^2 * r2)./((w_sync.*s(ii).*((r_th+(r2./s(ii)).^2 + (x_th+x2)^2)); 1 0 1 0 12 ...
environ 20 heures ago | 0
| accepted
Putting specific values to a matrix
https://www.mathworks.com/help/matlab/ref/perms.html values = [1 2 3]; perms(values)
environ 20 heures ago | 0
please show me how to use 'line commander'
u=line(x,y,'Color','k','LineWidth',2);
1 jour ago | 0
Error in plotting the waves.
You initialize y1_rec and y2_rec to all zero, and you assign 0 to y1_rec(1) and y2_rec(1), but you never assign anything non-zer...
1 jour ago | 0
why is there an error in line 13 of my coding ?
Lfsl = 10*log((((3*10^8)./f)).^2)/((4*pi)^2).*d.^2; % finding free space loss
1 jour ago | 0
Help with while loop
dt = input('Enter the desired time step: '); while dt >= h^2 / (4*alpha) fprintf('solution is unstable\nPlease enter a val...
1 jour ago | 1
Query regarding finding the index which will give 90% of the total area under the curve
A = cumtrapz(x, y); x_idx = find(A >= 0.9 * A(end), 1);
1 jour ago | 1
| accepted
Piecewise to Heaviside problem
syms f(x) t f(x) = piecewise(x<0, 0, 0 <= x & x < 2, x^2 - 1, 2 <= x & x < 5, 2*x - 3, 5 <= x, sin(x)); f(t) sympref('Heavisi...
1 jour ago | 1
why do I have an error on the length function?
You do not have an error on the length function. You have an error on the lenght function. length <- what you want lenght <...
1 jour ago | 1
how to overcome error: Index in position 1 is invalid. Array indices must be positive integers or logical values.
alpha=0.1:0.1:1; When you multiply by 10 you do not always get integers. 0.1 does not have an exact representation in finit...
1 jour ago | 0
how to plot a function symbolically?
You have 3 independent variables and 1 dependent variable. You will need a 4D plot. Unfortunately: # there are no symbolic 4d...
1 jour ago | 0
Please convert this c program into matlab code
That code cannot be converted to MATLAB: it depends on standard input for reading from the user, but MATLAB does not have standa...
1 jour ago | 0
How I can write this equation in matlab codes?
Use a vector calculation to calculate the entries inside the summation -- there are only 9 of them. Then sum() them. abs() and s...
1 jour ago | 0
I am a beginner, can anyone please help me writing a code for this equation to find 'x' using iteration
That looks like homework. syms x lhs = 1 + sym(4.56)^2/sym(40)^2; rhs = gamma(1+2/x) / gamma(1+1/x)^2 fplot([lhs-rhs,0], [-2...
1 jour ago | 0
Converting strings to operators
S = '(2*3)+Z*14*(3*5)+(7)*(9)-(11)*13' while true newS = regexprep(S, {'\((\d+)\)\*\((\d+)\)', '\((\d+)\)\*(\d+)', '(\d+)\*\...
1 jour ago | 0
| accepted
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