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Walter Roberson


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46,819 2011 이후 총 참여 횟수

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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Keeping command line programs open while inputting and outputting text files
You should be using .Net processes https://blogs.mathworks.com/loren/2010/12/07/using-microsoft-net-to-expand-matlab-capabili...

약 6시간 전 | 0

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run .exe file with matlab in unix
exe files are Windows executables that are not directly usable in Unix. If you have a windows emulator such as wine you might...

약 23시간 전 | 0

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matlab conersion code needed
Change the endif to end Change the endfor to end I did not see anything else at the moment

약 23시간 전 | 0

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how to find a exact word in a string?
length(regexp(str, '\<talk\>'))

1일 전 | 0

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How to solve this system of nonlinear equations composed of symbolic variables
F=@(x,y)[eqn3;eqn4;eqn5]; Okay, F takes two arguments and ignores them and returns an array of items based on symbolic x ...

1일 전 | 0

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How to compute arccos for a matrix?
It depends what you are trying to calculate. Using the formulas at https://en.wikipedia.org/wiki/Arccos_(trigonometry)#General...

1일 전 | 0

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Replace string with another value
S = {'13 Jon Walker', '23 skidoo', '0 infinite way blvd'}; upper(regexprep(S, '^.*\s+(...).*', '$1'))

1일 전 | 0

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How can I do implicit differentiation
Example syms y(x) DY eqn = acot(x^2+x*y) - asin(x+y) == y^3-x; dy = diff(y); deqn = diff(eqn,x); Deqn = subs(deqn, dy, DY);...

1일 전 | 0

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How to insert special symbol into plot label?
DSQ = char(hex2dec('211a')); qval = randn(); mylabel = sprintf('%s factor = %g', DSQ, qval); xlabel(mylabel) Note: this will...

1일 전 | 0

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how to delete a row in a cell array
[~,idx] = sort(cell2mat(A(2:end,3))); A(idx(1:2)+1,:) = [];

1일 전 | 0

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Is that possible to view the codes of standalone application?
" Is there any way that someone views the codes through using .exe files?" Yes. Mathworks could do this. The reports I have s...

1일 전 | 1

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How to make a structure to be input of a function and then its updated version to be output of the function?
s = struct(); for K = 1 : 10 s = updatestruct(s); end for K = 1 : 10 s = updatestruct2(s); end disp(s) f...

1일 전 | 1

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Who could get all the data in the attached file by the matlab?
filename = 'tem-001.txt'; S = fileread(filename); SS = strjoin( regexp(S, '^\s*-?\d.*$', 'match', 'lineanchors', 'dotexceptnew...

1일 전 | 0

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merging date and time columns in a timetable
tt = table2timetable( YourTable, 'RowTimes', datetime(YourTable.Date) + duration(YourTable.Time) );

2일 전 | 0

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Error while Diagonalizing the Matrix
Do not use P^(-1), which is also known as inv(P), if you can avoid doing so. The calculations have too much numeric difficulty. ...

2일 전 | 0

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Downloading text files from Matlab causes them to be corrupted
Don't use Notepad. Use Notepad++ or any editor created in the last 20 years. Notepad is so old it is only able to properly handl...

2일 전 | 0

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Don't simplify while using 'latex'
In some of the earlier releases, it was possible to ask to, for example, latex('3*x - 5*x') It would not be unreasonable to wa...

2일 전 | 0

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Not got the ordered student suite license
Today is a holiday in the USA; it might be a few days before your order is processed.

2일 전 | 0

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fast fourier tranform gives unequals amplitudes for frequencies with initially (before the fft) the same amplitude
sin(2*pi*(900*10^-9)^-1*t) (900*10^-9)^-1 is 1111111.11111111 Hz. But your sampling frequency is 32768. You have about 33.9 cyc...

2일 전 | 0

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How to create an underline in text
https://www.mathworks.com/matlabcentral/answers/95028-how-can-i-create-a-latex-table-from-a-matlab-array shows the latex code ...

2일 전 | 2

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Is an infinite for loop infinite?
No, if you use for i=1:inf then MATLAB will stop after 9223372036854775806 iterations. That number is 2^63 - 2 On my system,...

3일 전 | 1

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A year containing a date or not
year = 2050; month = 1; has_sunday30 = weekday(datetime(year, month, 30)) == 1;

3일 전 | 0

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Undefined function or variable in my simple project
Your code only has alamatfile as a local variable to btnBrowse_Callback . You are not saving it for use in other functions. htt...

3일 전 | 0

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Size mismatch (size [1 x 11] ~= size [1 x 10]).
i=2:length(z), That is 2:10 j=1:length(z), That is 1:10, which is one element longer than i. D(i-1)+D(j) D(i-1) becomes D(1...

3일 전 | 0

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How to generate one random integer
The following generates integers natively. typecast(randi([0 255],1,8,'uint8'),'int64') The range is all possible integers bet...

3일 전 | 0

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Help Needed for the following coding problem
z1_dot(:,i) = gamma*(1-z1(:,i))-kp*sumz1(:,i)+ki*sumw1(:,i); Those create numeric values that will be effectively constants aft...

3일 전 | 0

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I keep getting a warning that says polynomial is badly conditioned when I use polyfit() to find the polynomial.
If your x values range from 0 to 2000, then you cannot numerically justify a degree 10 polynomial fit. Consider that for x = 1, ...

3일 전 | 0

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imagesc funtion axes configuration
xlim([0 50]); xticks(0:5:50); %ticks at 0, 5, 10, 15, and so on Warning: none of your image x data is as low as 50...

3일 전 | 0

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Convert Fortran code to Matlab
1 FORM='UNFORMATTED',ACCESS='DIRECT', There is no standard for the representation of DIRECT UNFORMATTED files in fortran. The m...

3일 전 | 0

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