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Walter Roberson


42,221 2011 年以降の合計貢献数

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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Is there a way to add constraints (other than nonnegativity) on ode15s?
Only in the sense that you could add an event function to detect the value going out of range, and terminating when it does. If ...

約1時間 前 | 0

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Fsurf plot wrong when x coefficient is 0
When you construct an expression A*x + B*y + C with symbolic x and Y, and A is 0, then the symbolic engine does not deliberately...

約1時間 前 | 0

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How to extract data from Cell?
cellfun(@(M) M(1,ColumnToSelect), a(RowsToSelect)) Or in the special case of the cell containing row vector of the same lengt...

約2時間 前 | 0

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How to use polyfit to get the difference out of two functions?
P1 = polyfit((1:length(X)).', X(:), 6); Likewise for Y producing P2 Pd = polyval(P1, 1:length(X)) - polyval(P2, 1:length(X...

約3時間 前 | 1

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Plotting 2d data
t = 0.003 is a scalar, but you index t(i) Caution: your i and j are scalars, so plot(j, q(i,j), 'b-') is going to try to plot a...

約12時間 前 | 1

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get RGB data from image
Your search encounters a pixel with components 5 6 255 . Your test for assigning a new brightness requires that **all* of the r ...

約12時間 前 | 0

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different font sizes for y labels
set(gca, 'fontsize', 16) %the larger of the font sizes set(gca, 'YTickLabels', {'\fontsize{12}{-4}', '-2', '\fontsize{12}{0}'...

約13時間 前 | 0

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How can I present a 3D particle with cube mesh?
Use patch() with 'Faces' and 'Vertices' . I gave an example for a cuboid at https://www.mathworks.com/matlabcentral/answers/4441...

約13時間 前 | 0

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Find specific cell in another cells
match = {21 31 1} does not exist in your actual condition variable. Your actual condition is a cell array of cell arrays of cha...

約13時間 前 | 1

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Why is the last simulation value is "0",i can't find where is wrong
Your noise is complex valued, so your received_signal is complex valued. However, your if statements treat it as if it were real...

約14時間 前 | 0

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Curve fitting (curve fitting tool)
There is no supported way. There are ways that you could run your own code that would find the axes that is being used for th...

約17時間 前 | 0

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Can you make a section of a GUI jump back to another?
Create a function that does the functionality you want to "branch back to". Call that function from both callbacks. No duplicate...

約17時間 前 | 0

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limits are too large
X contains values up to +infinity . Y contains values as smal as -infinity . surf() cannot draw with X and Y coordinates that la...

約21時間 前 | 0

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Solving integrals with Matlab
syms x int( 7 + 1/sqrt(1-x^2), x, 0, 1/2 )

約21時間 前 | 1

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inline function with 3 variables
You cannot do that with inline functions. Every name you mention in an inline function must either be a function call (like tanh...

約22時間 前 | 0

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How to make solve() return a purely symbolic output?
No there is no way to prevent it. You have to not assign values to the variables if you do not want the values used.

1日 前 | 0

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text file I/O
We already explained. If you are passed something that is a character but the character is not found in the file then you need t...

1日 前 | 0

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How can I generate a random number between a specific range?
rand(rows, columns) * 50 + 50 csvwrite

1日 前 | 0

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How to integrate with SAP ERP
https://blogs.sap.com/2018/02/13/integration-of-matlab-compiler-runtime-in-sap-hana-extended-application-services-advanced-model...

1日 前 | 0

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xlsread function and ranges
"A"+((n-1)*48+1)+":B"+(n*48)

1日 前 | 1

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When running code it returns >> pp01 Error using plot Error in color/linetype argument. Error in pp01 (line 33) plot(t(:),z(:,1),'W',t(:),z(:,2),'F')
'W' is valid as a code for White but 'F' is not a color abbreviation and is not a marker shape code. Valid codes are * b: blu...

1日 前 | 0

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Unexpected error: A timeout occurred during the write operation..
Increase the serial output buffer size and also send less in one fprintf. Renegotiate the protocol with the other side so th...

1日 前 | 0

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is WLAN toolbox available in MATLAB 2018 version?
R2016a and later. Note that it is not available for Student licences.

1日 前 | 0

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why getpts doesn't give the correct points?
imshow() by default sets YDir reverse so that the "top" of the array (lowest row number) appears at the top of the screen (which...

1日 前 | 0

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How can I install mosek in matlab for free?
https://www.mosek.com/products/academic-licenses/ Personal academic license for mosek are free.

1日 前 | 0

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how do I fit a double exponential equation? there are two double exponential waveforms and I need to fit the equation into each waveform
You can use cftool with a custom equation. Be warned that sum of exponential are notoriously difficult to fit. If your initia...

1日 前 | 0

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Generated figure but no plot
After your for loop psi is a scalar.

1日 前 | 0

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remove rows with duplicates
need_to_delete = [false; any(ismember(YourArray(2:end,:), YourArray(1,:)),2)]; YourArray(need_to_delete, :) = [];

2日 前 | 0

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Unable to save file for Quiver
You can never imwrite() a graphics object, including not even if it is an image. Some kinds of graphics objects (such as images...

2日 前 | 0

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Error using the igrfmagn function (collecting the output)
time = 100; [mag_field_vector, hor_intensity, declinatioon, inclination, total_intensity] = deal(cell(size(time))); for i = 1:...

2日 前 | 0

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