# the cyclist

### No strings on me

Obsessive runner. Flâneur. Professional Interests: Predictive modeling, statistics. (I don't respond to email via author page, but will usually look at a question if you send me a link to it.)

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**Content Feed**

Extract data from matrices and arrays using vectors of coordinates

Use the sub2ind function to convert the subscripts to a linear index into the matrix. Using your example: A = [1 2 3; 3 4 5; 8...

ongeveer een uur ago | 0

For loop for correlation - linear indexing

I think you need to use A{:,i} instead of A(:,i) in the call to corrcoef.

ongeveer 3 uur ago | 0

Why LDA model generate a topic include stop words although these words don't exist in the data ?

I don't think it is possible to answer this question well without seeing the data. I think it is extraordinarily unlikely that ...

ongeveer 4 uur ago | 0

How to do a gauss partial pivot?

A = [1 2 3; 2 -1 1; 1 1 1] A./abs(max(A,[],2))

ongeveer 8 uur ago | 0

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Question about sorting an array column by column

choose_data = sort(choose_data) will sort every column independently. Ascending sorting is the default, so you don't need to sp...

ongeveer 8 uur ago | 0

Please explain how does this file work?

Because it does look like MATLAB code, it looks like you could add a .m extension to the file, and run it normally. I'm not sur...

ongeveer 14 uur ago | 0

| accepted

What " *.form='full' " means in making structure??

This is a GAMS question, not a MATLAB question. It looks like this page from the GAMS documentation discussing the form field. ...

ongeveer 24 uur ago | 0

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Error in line for CVX

I don't know CVX, but the error message seems straightforward. My best guess is that m is a variable of type cvx, and you are tr...

1 dag ago | 0

How to change variable value for every iteration in a for loop?

for na = 1:length(a) for n=1:length(x) %Coefficient of Lift at each panel l(n) = f(n).*(a(na))-((z(n)).*(...

1 dag ago | 0

How to plot specific values from a matrix of 10*10

M = [0 1 0 2; 0 2 0 3; 0 3 0 4]; colsToPlot = not(all(M==0)); figure plot(M(:,colsToPlot))

1 dag ago | 0

How to set a column vector as a legend name within multiple plots?

Don't take the transpose: legend(strcat('Alpha=',num2str(a1)))

1 dag ago | 0

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Index exceeds the number of array elements (1).

When you make this assignment: T_o=10+15.*sin((Hour-9).*(pi/12)); it looks like T_o is a scalar (i.e. length 1), but then you ...

1 dag ago | 0

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Feature request for postgres support

At least for the first two features, can't you just execute them directly as SQL statements?

2 dagen ago | 0

Need to delete outliers by seeing the plot

data = data(data>-4);

3 dagen ago | 0

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how to read mixed date and data

I would try the readtable function. You can specify the input formating if needed.

3 dagen ago | 0

How can I get multiple plots on one graph, not overlapping?

What an ugly and potentially confusing plotting style. Too bad you are being coerced into doing it that way. One way to do this...

3 dagen ago | 0

| accepted

How to convert string to double array in table

% My best guess at your data A = {'[28.346853874154966, 284.04836936606813, 57.820072802912115, 64.72700622938805]'; '[16.5200...

3 dagen ago | 0

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How can I create a Poll in a community

I am as certain as I can be that only MathWorks staff can create such a poll.

3 dagen ago | 0

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How to delete specific cells according to the condition from cell array?

This line of code will identify the cell locations that have a 7x4 array, having those two elements equal: deleteIdx = cellfun(...

3 dagen ago | 0

Is there a way to set the color tag attribute in macOS with MATLAB?

Yes, it is possible. Here is the github repo of a command line tool that will manipulate tags. You can call that command line ...

4 dagen ago | 1

| accepted

How can I get data from evaluating a function, say y=x^2+5 and put it in table?

x = linspace(0.1,0.9,50); y = x.^2+5; tbl = table(y.');

4 dagen ago | 1

| accepted

Linear regression fit model for Multi-variant responses

I think you need mvregress.

5 dagen ago | 0

Plotting data against time

New answer based on your update. The problem is that your original time series is in two different formats -- not including the...

6 dagen ago | 0

| accepted

Plotting data against time

Works for me, when I correctly specify valid dates using the input format. I'm guessing that your datetime is somehow messed up...

6 dagen ago | 0

How do I display multiple num2str in a single row

I expect you'd be much better off using sprintf to format your output.

7 dagen ago | 0

Why am I receiving the error "Array indices must be positive integers or logical values."?

Here is a completely different tack, that I think is less confusing because you just defining the function I(z) more naturally a...

7 dagen ago | 0

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How can I make an exponential fit using two points of my data.

You can use the 'Weights' Name-Value pair, and heavily weight the first point. Here is a made-up example. Notice how f2 passes t...

7 dagen ago | 0

| accepted

Why am I receiving the error "Array indices must be positive integers or logical values."?

You have at least two problems with your code. First, you need an explicit multiplication sign in these lines: I(i) = I0*sin(k*...

8 dagen ago | 1

Shaded Standard Deviation Corridors

It's because the last three values of x and y are NaN. dataset=xlsread('Book1.xlsx', 'Sheet1'); tensile_stress = dataset(:,1);...

8 dagen ago | 1

Visualize a vector field function with matlab

x = -3 : 0.5 : 3; y = -3 : 0.5 : 3; z = -3 : 0.5 : 3; [xx,yy,zz] = meshgrid(x,y,z); Fx = xx.*zz; Fy = xx.*yy; Fz =...

9 dagen ago | 1

| accepted