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dpb


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5,259 total contributions since 2012

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Answered
Using fzero to keep tolerance within limits
As the error message says, you need a function name/handle as the argument to fzero not just an expression. >> fn=@(T)100*(0.15...

2 hours ago | 0

Answered
Error using plot Vectors must be the same length.
On the right track, just have to use the index for both variables... index_liq = (M_CP==2); % index to...

3 hours ago | 0

Answered
Running all Nastran input .bdf files contained in a folder using Matlab
files = dir('*.bdf'); for i = 1 : length(files) filename = files(K).name; system('D:\MSC.Software\MSC_Nastran\20180\bin\n...

5 hours ago | 0

Answered
Detrending a time series with NaN values
With recent (but I'm not sure just how recent) releases, there's the 'omitnan' optional parameter in detrend that will skip the ...

18 hours ago | 0

Answered
Error using chckxy: The first input must contain unique values, while using only unique values
>> load dados >> whos x y Name Size Bytes Class Attributes x 1x58 464 double...

20 hours ago | 0

Answered
How to convert memory to Megabyte
>> m=memory; >> sprintf('%.0f MB',m.MemUsedMATLAB/(1024^2)) ans = '2305 MB' >>

22 hours ago | 0

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Answered
How do I set the some letters in an Excel sheet cell to 'BOLD' through ACTXSERVER using MATLAB (R2019a)?
This isn't MATLAB per se, but Excel VBA/object model syntax Q? A sample VBA function would look something like lngPos = InStr(...

1 day ago | 0

Answered
Generating a normal distrbution random numbers and setting them to catagories
function [abc,ABC]=random_gen(n) r=randn(n,1); % generate column vector N rn ix=disc...

3 days ago | 0

Answered
Change color of numbers at colorbar
Undocumented property -- underneath is a NumericRuler object which does control the axes ticklabels independently. figure surf...

3 days ago | 0

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Answered
Plot year as major ticks and months as minor ticks
If your time data are evenly-spaced and at monthly intervals, hAx=gca; hX=hAx.XAxis; % get handle to X datetime ruler...

3 days ago | 0

Answered
URGENT help on TSA with tach signal
I've not used it, but doc (and error message) indicate that the time pulse input is either a fixed scalar or increasing time for...

3 days ago | 0

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Answered
plotting group size vs total member in group of particular size
v =[1 1 1 2 2 3 4 4 5]; % engine u=unique(v); ng=histc(v,u); U=unique(ng) U = 1 2 3 NU=histc(ng,U) ans ...

3 days ago | 0

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Answered
Convert a Complex Number to exponential real
MATLAB has builtin functions abs (or hypot()) and angle() for the above explicit implementations... >> x=complex(2,5); >> cm...

3 days ago | 1

Answered
Extracting elements from one matrix and placing in another
MATLAB assigns the complete array to the LHS without having used subscrpting to indicate you want to place each plane extracted ...

3 days ago | 1

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Listing C: folder contents
"The dir command in the Windows command shell behaves in this way, but that's no reason for the MATLAB command to do the same th...

4 days ago | 0

Answered
How to print strings from a data text file that is in correlation to an indices text file?
Put the indices into a 3D array and just index -- indices(:,:,1)=[1 6 2 3; 3 2 4 0; 1 6 4 7; 0 1 4 7; ... 0 5 ...

4 days ago | 0

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Answered
How to improve efficiency when checking for unique combinations of table values?
tFruit=readtable('fruit.txt'); tFruit=tFruit(:,[1:2:end]); tFruit.Properties.VariableNames={'Fruit','Color','Data'}; tFruit.F...

5 days ago | 0

Answered
Removing Leading Spaces before xml tags at each line.
The tool seems to format the file to reflect the XML structure; dunno why it would necessarily hurt, but I don't do such things ...

5 days ago | 1

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Answered
How can I solve multiple equations? (Pipeline Design)
function Pc=pipelineExternalPC(d,t,sy) % Usage: % Pc=pipelineExternalPC(d,t,sy) % % returns Pc, pipeline external collapse...

6 days ago | 1

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Answered
Define a matrix in terms of kronecker product
>> I=3;N=4; >> kron(ones(1,N),eye(I)) ans = 1 0 0 1 0 0 1 0 0 1 0 0 0 ...

6 days ago | 0

Answered
Scientific notation at y-axis with "ax.YAxis.Exponent"
Well, here's a crude first pass... expn=floor(log10(yticks)); mant=yticks./10.^(expn); lbls=cellstr(num2str([mant;expn].','%d...

8 days ago | 0

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Answered
Scientific notation at y-axis with "ax.YAxis.Exponent"
I don't see a user-settable format to force the notation (although I didn't use Yair's getundoc to poke) with arbitrary tick val...

8 days ago | 0

Answered
FFT, dominant frequency doesnt match time domain?
Your problem is simply that the dominant frequency isn't the same as one of the frequency bin midpoints depending on the number ...

9 days ago | 2

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Answered
Change one line in Excel file
I'd avoid xlswrite and use writecell instead. Use the 'Range' parameter to put in the right place and not disturb anything else...

9 days ago | 0

Answered
How to find the find the pattern in each row of Matrix?
A=[A;A(3,:)]; % make sure one row has same pattern % the engine B=(A~=0); ...

9 days ago | 1

Answered
How to make segmented regression line and determine the breakpoints?
I've answered this several time in the past, but never think to keep a link... https://www.mathworks.com/matlabcentral/answers/...

10 days ago | 0

Answered
Conditional Scatter plotting based on third data set
>> SX=1*all(M==1)+2*(any(M==2)&any(M==3))+3*all(M==3) SX = 2 1 2 1 3 >> Create categorical variable fr...

10 days ago | 0

Answered
callculating values using cfit object with multiple p values
I don't see any syntax by which to do that with the coefficents for multiple fits stored that way and the doc for cfit explicitl...

10 days ago | 0

Answered
While loop to get a specific section of data
Far easier if you would attach a (small) sample of the dataset, but the general idea would be thresholdUp=1; ...

11 days ago | 0

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Answered
How to count "gaps" consisting of designated values in a vector and obtain start and end indices?
v=sprintf('%d',ismember(sample_data_vector,invalid_values)|isnan(sample_data_vector)); iStart=strfind(v,'01')+1; iEnd=strfind(...

11 days ago | 0

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