Data scientist at Cohen Veterans Bioscience; Obsessive runner. 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.)

Answered

My is my matrix can't multiply with this vector

Your variables tranposeA and y have sizes 2x4 and 1x4, respectively. It is unclear to me whether you wanted a matrix multiplica...

My is my matrix can't multiply with this vector

Your variables tranposeA and y have sizes 2x4 and 1x4, respectively. It is unclear to me whether you wanted a matrix multiplica...

1 day ago | 0

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Answered

How to assemble 3D array from four vectors

Here is one way: G = reshape([FF; MF; FM; MM],2,2,6)

How to assemble 3D array from four vectors

Here is one way: G = reshape([FF; MF; FM; MM],2,2,6)

2 days ago | 0

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Answered

how to graph using loop?

Put the command hold on on the line after figure. See the documentation for the hold command for details.

how to graph using loop?

Put the command hold on on the line after figure. See the documentation for the hold command for details.

2 days ago | 0

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Answered

How to arrange indices of a real array ?

Rankig = [ 0.6229 , 0.6516 , 0.2036 , 0.0997 , 0.5986 , 0.5897 , 0.7667 , 0.4887]; [~,Indexes] = sort(Rankig); [~,Indexes2...

How to arrange indices of a real array ?

Rankig = [ 0.6229 , 0.6516 , 0.2036 , 0.0997 , 0.5986 , 0.5897 , 0.7667 , 0.4887]; [~,Indexes] = sort(Rankig); [~,Indexes2...

3 days ago | 0

Answered

How to arrange indices of a real array ?

You are just interpreting the output incorrectly. [B, Indexes] ans = 0.7667 0.6516 0.6229 0.5986 0.5897 ...

How to arrange indices of a real array ?

You are just interpreting the output incorrectly. [B, Indexes] ans = 0.7667 0.6516 0.6229 0.5986 0.5897 ...

3 days ago | 0

Answered

Finding unique slices of a multidimensional array

% Define a 3-d array of pretend data, that has a couple duplicate slices % (Use your data instead) rng default A = rand(2,2,4...

Finding unique slices of a multidimensional array

% Define a 3-d array of pretend data, that has a couple duplicate slices % (Use your data instead) rng default A = rand(2,2,4...

4 days ago | 1

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Answered

Cell returns different number of rows in a loop - How to align this?

Something like this should help: % Define the old and new phases info phases_old = {'eta';'mu'}; phases_new = {'eta';'mu';'mu...

Cell returns different number of rows in a loop - How to align this?

Something like this should help: % Define the old and new phases info phases_old = {'eta';'mu'}; phases_new = {'eta';'mu';'mu...

5 days ago | 0

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Answered

How to calculate the slope of select data points across entire dataset?

Here is a straightforward method. I commented the code, so I hope you can follow the algorithm I didn't see how you wanted to c...

How to calculate the slope of select data points across entire dataset?

Here is a straightforward method. I commented the code, so I hope you can follow the algorithm I didn't see how you wanted to c...

14 days ago | 0

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Answered

Why do i get tstat Inf after a linear regression?

The root cause is that your model is "perfect". The model is effectively y = b1 + b2*x1 + b3*x2 + b4*x1*x2 which means you hav...

Why do i get tstat Inf after a linear regression?

The root cause is that your model is "perfect". The model is effectively y = b1 + b2*x1 + b3*x2 + b4*x1*x2 which means you hav...

17 days ago | 0

Answered

Hold on function doesn't work

The problem with your code is not with the hold command. The problem is the syntax to plot the line. You plotted a 1x200 vector ...

Hold on function doesn't work

The problem with your code is not with the hold command. The problem is the syntax to plot the line. You plotted a 1x200 vector ...

25 days ago | 0

Answered

Very confused about MLE

Let's step back to the big conceptual picture. The mle function is estimating the most likely parameters for a distribution of s...

Very confused about MLE

Let's step back to the big conceptual picture. The mle function is estimating the most likely parameters for a distribution of s...

1 month ago | 2

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Answered

how to plot only one datapoint at a time with a 1 second delay from a dataset

Here is one way: TestPoints=[1 4 6;2 1 4;3 2 3;4 1 5;5 3 4;6 1 6;7 2 6;8 2 6]; figure for nr = 1:size(TestPoints,1) pl...

how to plot only one datapoint at a time with a 1 second delay from a dataset

Here is one way: TestPoints=[1 4 6;2 1 4;3 2 3;4 1 5;5 3 4;6 1 6;7 2 6;8 2 6]; figure for nr = 1:size(TestPoints,1) pl...

1 month ago | 0

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Answered

how to make intervals in a bar graph

Here is one way: w = 42.5 : 5.0 : 62.5; n = [4 12 13 6 5]; bar(w,n,'BarWidth',1) FYI, if you have the underlying ind...

how to make intervals in a bar graph

Here is one way: w = 42.5 : 5.0 : 62.5; n = [4 12 13 6 5]; bar(w,n,'BarWidth',1) FYI, if you have the underlying ind...

1 month ago | 0

Answered

How to get a random vector whose elements arrangement is the same as that of my desired vector

Do you want something like this, which adds some random "noise" around the elements of u? u = [3 1 5 105 155 50]; m = 10; n...

How to get a random vector whose elements arrangement is the same as that of my desired vector

Do you want something like this, which adds some random "noise" around the elements of u? u = [3 1 5 105 155 50]; m = 10; n...

2 months ago | 0

Answered

Error using plot Not enough input arguments.

If you take a look at the documentation for the plot function, you will see that it cannot take cell arrays as input. I'm not e...

Error using plot Not enough input arguments.

If you take a look at the documentation for the plot function, you will see that it cannot take cell arrays as input. I'm not e...

2 months ago | 0

Answered

shuffle indexes when sorting matrix

One way that springs to mind is to add a small, random "jitter" to the values in the image. The jitter magnitude should be small...

shuffle indexes when sorting matrix

One way that springs to mind is to add a small, random "jitter" to the values in the image. The jitter magnitude should be small...

2 months ago | 1

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Answered

How to suppress this error?

Two thoughts: First: Are you certain you have the correct warning? After you run your code that gives the warning, what is the ...

How to suppress this error?

Two thoughts: First: Are you certain you have the correct warning? After you run your code that gives the warning, what is the ...

2 months ago | 0

Answered

Dot indexing is not supported for variables of this type???

Complete guess here. Are you simply trying to multiply the two variables? If so, then E(i).*tx(rr-1) Just using a dot, by itse...

Dot indexing is not supported for variables of this type???

Complete guess here. Are you simply trying to multiply the two variables? If so, then E(i).*tx(rr-1) Just using a dot, by itse...

2 months ago | 0

Answered

How to interpret entries in documentation's left pane

In that left-hand pane, the following pages are at the same "level of the documentation hierarchy": Get Started with MATLAB Com...

How to interpret entries in documentation's left pane

In that left-hand pane, the following pages are at the same "level of the documentation hierarchy": Get Started with MATLAB Com...

2 months ago | 1

Answered

Probability of Combinations Occurring

By "unique combinations", I assume you mean unique rows. Here is one way: % Example dataset. (Use your data instead.) x = [7 ...

Probability of Combinations Occurring

By "unique combinations", I assume you mean unique rows. Here is one way: % Example dataset. (Use your data instead.) x = [7 ...

2 months ago | 0

Answered

multiplying scalar by matrix

In the exponentials, you missed an important set of parentheses, ensuring that you divide by the whole expression (lambda .* k ...

multiplying scalar by matrix

In the exponentials, you missed an important set of parentheses, ensuring that you divide by the whole expression (lambda .* k ...

2 months ago | 0

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Answered

How can i create a for loop that modifies a column in an existing matrix?

I would use the histcounts command to do this task: A = [1,1,3,4,5,1]; dicevalue = [1,2,3,4,5,6]'; throwCounts = histcounts...

How can i create a for loop that modifies a column in an existing matrix?

I would use the histcounts command to do this task: A = [1,1,3,4,5,1]; dicevalue = [1,2,3,4,5,6]'; throwCounts = histcounts...

2 months ago | 0

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Answered

Question about writing a function.

In the future, you might want to separate two such different questions as two different posts here. For your first question, wh...

Question about writing a function.

In the future, you might want to separate two such different questions as two different posts here. For your first question, wh...

2 months ago | 0

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Answered

How to same size of plot and histogram

I think that using h1= histogram(data2p,'Normalization','pdf'); h2= histogram(data3p,'Normalization','pdf'); and of course r...

How to same size of plot and histogram

I think that using h1= histogram(data2p,'Normalization','pdf'); h2= histogram(data3p,'Normalization','pdf'); and of course r...

2 months ago | 1

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Answered

draw a boxplot from a probability density function

Here is a very kludgy way to do it. You can generate a small "sample" dataset that has the same summary statistics as your PDF, ...

draw a boxplot from a probability density function

Here is a very kludgy way to do it. You can generate a small "sample" dataset that has the same summary statistics as your PDF, ...

2 months ago | 0

Answered

Delete overlaping intervals in matrix

I expect there is a more elegant approach, but here is a straightforward way: M = [100 200 5; 150 210 7; 205 300 9;...

Delete overlaping intervals in matrix

I expect there is a more elegant approach, but here is a straightforward way: M = [100 200 5; 150 210 7; 205 300 9;...

2 months ago | 0

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Answered

Delete overlaping intervals in matrix

I believe this does what you want: M = [100 200; 150 210; 190 300; 300 400; 410 600; 500 700]; keepRow = M(2:end,1) >= M(1:end...

Delete overlaping intervals in matrix

I believe this does what you want: M = [100 200; 150 210; 190 300; 300 400; 410 600; 500 700]; keepRow = M(2:end,1) >= M(1:end...

2 months ago | 1

Answered

I want to use the Python libraries in MATLAB

Have you seen this documentation on calling python modules from MATLAB?

I want to use the Python libraries in MATLAB

Have you seen this documentation on calling python modules from MATLAB?

2 months ago | 0