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

How to correct matrix dimension disagree error

You are effectively trying to do this operation in your code: n * u where n is a 1x4 matrix, and u is a 1x100 matrix. That wo...

How to correct matrix dimension disagree error

You are effectively trying to do this operation in your code: n * u where n is a 1x4 matrix, and u is a 1x100 matrix. That wo...

etwa eine Stunde ago | 0

Answered

Select specific cells from a cell array and create a seperate vector

Does your cell array have only numeric values in it? If yes, then maxVal = max(cell2num(C),[],3) where C is your cell array.

Select specific cells from a cell array and create a seperate vector

Does your cell array have only numeric values in it? If yes, then maxVal = max(cell2num(C),[],3) where C is your cell array.

etwa 2 Stunden ago | 0

Answered

How to create a distribution of the spread of the data from its mean

Does using subplots help show your point better? % Load the data load Data1.mat % Convert from table to numeric Data = tab...

How to create a distribution of the spread of the data from its mean

Does using subplots help show your point better? % Load the data load Data1.mat % Convert from table to numeric Data = tab...

etwa 2 Stunden ago | 0

Solved

Say something funny

Say something funny, or not. Your solution will be (fully automatically and objectively) scored based on how clever or funny ...

etwa 6 Stunden ago

Answered

set default line marker symbol

See this answer from Mathworks support.

set default line marker symbol

See this answer from Mathworks support.

etwa 16 Stunden ago | 0

Answered

how to find the Reverse process of A(B).

C = [9 4 2 1 7 6 8 5 3 8 11]; A(B) = C

how to find the Reverse process of A(B).

C = [9 4 2 1 7 6 8 5 3 8 11]; A(B) = C

ein Tag ago | 1

Answered

How do I find the column of maximum values of a maxtrix?

Here is one way to do it. [~,linearIndex] = max(x,[],'all','linear'); % First, find the *linear* index of x [rowIndex,colIndex...

How do I find the column of maximum values of a maxtrix?

Here is one way to do it. [~,linearIndex] = max(x,[],'all','linear'); % First, find the *linear* index of x [rowIndex,colIndex...

ein Tag ago | 0

Answered

How can I do polynomial fitting when X-axis is time

Hm. Plotting the data you posted, using the seconds function, results in exactly what I would expect -- including capturing the ...

How can I do polynomial fitting when X-axis is time

Hm. Plotting the data you posted, using the seconds function, results in exactly what I would expect -- including capturing the ...

2 Tage ago | 0

Answered

Get the diagonal without calculating the explicit matrix

Here is one way: % Make up some inputs N = 4; B = rand(N); C = rand(N); % Calculate the diagonal A_diag = 0; for nr = 1...

Get the diagonal without calculating the explicit matrix

Here is one way: % Make up some inputs N = 4; B = rand(N); C = rand(N); % Calculate the diagonal A_diag = 0; for nr = 1...

3 Tage ago | 1

Answered

Find the sum of the vector using a for loop

If you type the expression 50:1 into MATLAB, you will get the result >> 50:1 ans = 1×0 empty double row vector So, y...

Find the sum of the vector using a for loop

If you type the expression 50:1 into MATLAB, you will get the result >> 50:1 ans = 1×0 empty double row vector So, y...

3 Tage ago | 0

Answered

Index exceeds the number of array elements (1)

You didn't answer Ameer's first question, but it seems clear that when you call the function diggerangle(L_12, L_23, L_13, x) %...

Index exceeds the number of array elements (1)

You didn't answer Ameer's first question, but it seems clear that when you call the function diggerangle(L_12, L_23, L_13, x) %...

3 Tage ago | 1

Answered

How to write a custom non linear function for data fitting?

I don't have the Curve Fitting Toolbox, so I can't really comment on your current code. But, if you also have the Statistics and...

How to write a custom non linear function for data fitting?

I don't have the Curve Fitting Toolbox, so I can't really comment on your current code. But, if you also have the Statistics and...

5 Tage ago | 1

Answered

Plot and fit exponential decay probability of population

You are correct to use the ecdf function. I think the piece you are missing is the use of the 'censoring' input. Take a look at ...

Plot and fit exponential decay probability of population

You are correct to use the ecdf function. I think the piece you are missing is the use of the 'censoring' input. Take a look at ...

5 Tage ago | 0

| accepted

Answered

matlab gives wrong answer to determinant of a 3x3 matrix

MATLAB gives the correct result to within the limits of double-precision floating-point arithmetic. This is a very common quest...

matlab gives wrong answer to determinant of a 3x3 matrix

MATLAB gives the correct result to within the limits of double-precision floating-point arithmetic. This is a very common quest...

6 Tage ago | 1

Answered

How do I print unknown values

vectorA = [2 3 5 7]; ['Vector A is: [',sprintf('%6.3f', vectorA),']']

How do I print unknown values

vectorA = [2 3 5 7]; ['Vector A is: [',sprintf('%6.3f', vectorA),']']

7 Tage ago | 0

| accepted

Answered

How to fit multiple peaks using Gaussian funtion

Never this the original of this question, but saw the comment. If you have the Statistics and Machine Learning Toolbox, I belie...

How to fit multiple peaks using Gaussian funtion

Never this the original of this question, but saw the comment. If you have the Statistics and Machine Learning Toolbox, I belie...

7 Tage ago | 0

Answered

Hyerbolic Functions causing issues with Contour Plots.

I ran the following code k = 0.5; l = 0.5; k1=((k+(1/2))*pi)^4; l1=((l+(1/2))*pi)^4; v1 = @(x,y) cos(k1*x)-cosh(k1*x)-(...

Hyerbolic Functions causing issues with Contour Plots.

I ran the following code k = 0.5; l = 0.5; k1=((k+(1/2))*pi)^4; l1=((l+(1/2))*pi)^4; v1 = @(x,y) cos(k1*x)-cosh(k1*x)-(...

7 Tage ago | 0

Answered

make rectangular with vectors

You say that you have a problem with "one" of your lines, but I think you have a deeper conceptual problem with how you tried to...

make rectangular with vectors

You say that you have a problem with "one" of your lines, but I think you have a deeper conceptual problem with how you tried to...

8 Tage ago | 1

| accepted

Answered

what is wrong with my code, i am trying to plot below

FYI, there is a much more efficient solution, which is to avoid the for loop altogether: t = 1:.01:10; x = zeros(size(t)); ...

what is wrong with my code, i am trying to plot below

FYI, there is a much more efficient solution, which is to avoid the for loop altogether: t = 1:.01:10; x = zeros(size(t)); ...

8 Tage ago | 0

Answered

what is wrong with my code, i am trying to plot below

In every iteration of the for loop, you are simply overwriting x, over and over. Instead, you need to define a vector for x, to...

what is wrong with my code, i am trying to plot below

In every iteration of the for loop, you are simply overwriting x, over and over. Instead, you need to define a vector for x, to...

8 Tage ago | 0

| accepted

Answered

whats wrong with my code?

He wrote dx = [0]; and you wrote dx[0];

whats wrong with my code?

He wrote dx = [0]; and you wrote dx[0];

8 Tage ago | 1

| accepted

Answered

Save image containing plotted lines

I would expect print('-dpng','-r600','HoughLines.png') to work. You could also try the export_fig utility from the File Excha...

Save image containing plotted lines

I would expect print('-dpng','-r600','HoughLines.png') to work. You could also try the export_fig utility from the File Excha...

9 Tage ago | 0

Answered

How to save any trained machine learning model to use it for prediction later?

The standard calling syntax, e.g. Mdl = fitrensemble(Tbl,ResponseVarName); stores everything you need in the model object name...

How to save any trained machine learning model to use it for prediction later?

The standard calling syntax, e.g. Mdl = fitrensemble(Tbl,ResponseVarName); stores everything you need in the model object name...

9 Tage ago | 0

| accepted

Answered

Perform inverse of each double within a cell

Why do you think you cannot use cellfun? Period = {[2 3; 5 7],[11 13]}; Frequency = cellfun(@(x)1./x,Period,'UniformOutput',...

Perform inverse of each double within a cell

Why do you think you cannot use cellfun? Period = {[2 3; 5 7],[11 13]}; Frequency = cellfun(@(x)1./x,Period,'UniformOutput',...

10 Tage ago | 0

| accepted

Answered

factoran Error, "Some columns of the X matrix are constant."

You've asked questions about three errors: some columns of the X matrix are constant the number of factors requested, M, is to...

factoran Error, "Some columns of the X matrix are constant."

You've asked questions about three errors: some columns of the X matrix are constant the number of factors requested, M, is to...

10 Tage ago | 0

Answered

How can I generate a random number from a chi square distribution?

If you have the Statistics and Machine Learning Toolbox, you can use the randsample command to do weighted probabilities. In the...

How can I generate a random number from a chi square distribution?

If you have the Statistics and Machine Learning Toolbox, you can use the randsample command to do weighted probabilities. In the...

12 Tage ago | 0

Answered

how to plot cosx*coshx+1=0

I don't have the Symbolic Math Toolbox, so I can't comment on your code. But this worked for me. f = @(x) (cos(x)).*(cosh(x))+1...

how to plot cosx*coshx+1=0

I don't have the Symbolic Math Toolbox, so I can't comment on your code. But this worked for me. f = @(x) (cos(x)).*(cosh(x))+1...

13 Tage ago | 0

| accepted

Answered

Which paper should be cited for the genetic algorithm used in Matlab 2019a

One source of references is the documentation for the function (which I'm guessing is where you found the reference you have). ...

Which paper should be cited for the genetic algorithm used in Matlab 2019a

One source of references is the documentation for the function (which I'm guessing is where you found the reference you have). ...

15 Tage ago | 0