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# Jeremy Marcyoniak

### MathWorks

42 total contributions since 2019

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3x3 matrix with while loop
n = 3; m = 3; A = zeros(n,m); while det(A) == 0 A = rand(n,m); end

3 days ago | 0

quick reference guide for plotting
https://www.mathworks.com/help/matlab/ref/plot.html#btzitot-LineSpec

3 days ago | 0

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input multi workspaces in function
Put the data into one array, pass it into the function, and parse the array inside the function?

3 days ago | 0

How can I run Simulink 'Build model' from the command line
I'm not sure if I'm understanding your use case completely, but I think you are looking for sim? sim('modelname.slx'); If that...

21 days ago | 0

Replace all instances of a value with random number
A = [0 1 0 1; 1 0 1 1; 0 0 1 1]; id = A==1; r = rand(1,nnz(id)); A(id) = r;

22 days ago | 0

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How to remove the table size below the table header; e.g., get rid of --> " 1×7 table "
The 1x7 table is not part of the table, it's part of the default display when you type a variable name with no formatting, you c...

24 days ago | 1

how to keep labels in matlab with multiplotyyy function ?
x = linspace(1,10,201); y1 = x.^2; y2 = log(x); pyh = plotyy(x,y1,x,y2); legend('x^2','ln(x)') ax = gca; xlabel('x') ax.X...

24 days ago | 0

Matrix Shifting: columns to single row
A = [1 2 3; 4 5 6; 7 8 9] B = reshape(A',[1,numel(A)])

1 month ago | 0

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Can the diff function go the opposite direction?
sure, flip your matrix with fliplr or flipud and then run diff

1 month ago | 0

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"Index exceeds the number of array elements (217)"
If you have 217 rows and you're trying to index row 478 then Matlab will throw an error also, the ,1 will need to be outside ...

1 month ago | 0

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How to find values in a range and save them to different arrays, repeatedly
target_times= randi(120000,1,64); bins = 10000:10000:120000; c = cell(12,1); c{1} = target_times(target_times < bins(1)); fo...

1 month ago | 0

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Indexing portions of a vector with array

1 month ago | 0

Having issues with a function: creates NxN matrix instead of a column vector
Are the inputs p, sigma, N scalar values or vectors? Does normrnd return a vector or a scalar? That seems to be a function you w...

1 month ago | 0

Interval where values are greater than treshold
I believe you are looking for the find command. find(Logic)

1 month ago | 0

How can I shade confidence intervals and assign colors to frequency spectra plot (pwelch)
The plot commands accept a 3 element vector in place of the built-in colors, each element being a number between 0 and 1 represe...

2 months ago | 0

Add error bars to grouped bar plot
Like this? https://www.mathworks.com/help/matlab/creating_plots/bar-chart-with-error-bars.html

2 months ago | 0

How map values of array to 0 and 1
normalized_array = normalize(array,'range',[0 1]);

2 months ago | 1

Brace indexing is not supported for variables of this type
Mu_s{:} < 1.0 && Mu_d{:} < 7.0

2 months ago | 0

Using now() in different time zones (or with daylight saving time)
From the documentation for now Limitations MATLAB Online returns the current date and time in Coordinated Universal Time (UTC...

2 months ago | 0

Having an array V from 0 to 44.8 in steps of 0.01, I try to use the function find(V == 30) and I get and empty array. Why?
I suspect this is a case of roundoff error. A workaround would be find(Volt > 29.999 & Volt < 30.001); Using whatever toleranc...

2 months ago | 0

The code runs, but imediately deletes the animation and does not update
delete(P1_pos_cir); delete(P2_pos_cir); delete(P3_pos_cir); delete(P4_pos_cir); delete(P5_pos_cir); ...

2 months ago | 0

Confusion manipulating timestamp and plotting
Is each number supposed to represent a datetime as a "datenum" data type? t = 0.0517361112797516; d = datetime(t,'ConvertFrom'...

2 months ago | 0

How to include string + numbers in a table using a for...end routine

2 months ago | 0

Error while using writematrix to save complex values in a .txt
csvwrite Does this correctly. I will look into writematrix

2 months ago | 1

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Using fzero to solve an equation with different constants every time
x0=[0;1]; By passing a vector into fzero you are telling it that you think the solution is between these values, so it will sta...

2 months ago | 0

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How do I get the date out of a filename using regexp?
str = 'xxx_2014_06_03_00_00_01'; id = regexp(str,'\d') Returns: id = 5 6 7 8 10 11 13 14 16 ...

2 months ago | 0

Solving non-linear equation including natural logarithm
Most probably, there is no analytical solution for y in terms of (a,b,c,x). You can solve numerically for y at given values of a...

2 months ago | 0

how to mathematical modelling the solar PV in Simulink?
Hi, The "sum" block in the "Photo Current" subsystem is meant to be +/- according to the model - your current setup has a +/+. ...

2 months ago | 0