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.)

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Array indices must be positive integers or logical values.

Your variable A is the image data. Your variable t is the value of the image data at the (x,y) coordinate. That value of t coul...

Array indices must be positive integers or logical values.

Your variable A is the image data. Your variable t is the value of the image data at the (x,y) coordinate. That value of t coul...

약 12시간 전 | 0

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Inconsistency of angle function in finding angle of vectors

I would not characterize this as an inconsistency, so much as a convention to report the value in the range [-pi,pi], rather tha...

Inconsistency of angle function in finding angle of vectors

I would not characterize this as an inconsistency, so much as a convention to report the value in the range [-pi,pi], rather tha...

1일 전 | 0

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How to Apply PCA Corrrect way

Your question, especially when you ask about the 88x88 matrix that is output from pca(), indicates that you don't really underst...

How to Apply PCA Corrrect way

Your question, especially when you ask about the 88x88 matrix that is output from pca(), indicates that you don't really underst...

1일 전 | 0

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How can I fit Bessel function of 1st kind with the scatter plot?

I don't have the Curve Fitting Toolbox, so I cannot help with that. However, I used fitnlm, and I see a couple strange things a...

How can I fit Bessel function of 1st kind with the scatter plot?

I don't have the Curve Fitting Toolbox, so I cannot help with that. However, I used fitnlm, and I see a couple strange things a...

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plot (t,y) ,dimension failure

The answer is right there in the error message. Use elementwise multiplication instead of matrix multiplication. clear all; clo...

plot (t,y) ,dimension failure

The answer is right there in the error message. Use elementwise multiplication instead of matrix multiplication. clear all; clo...

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Check true if value in a matrix is increasing,decreasing or staying same

Use the diff command, and check whether the result is greater than zero, etc.

Check true if value in a matrix is increasing,decreasing or staying same

Use the diff command, and check whether the result is greater than zero, etc.

4일 전 | 0

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Unable to perform assignment because the left and right sides have a different number of elements.

It looks like inside your function, in these lines dS = ((-beta*(B/(B+k))*S(tt) + ub*(S(tt)+I(tt)+R(tt)) - ud*S) * dt)'; dI = ...

Unable to perform assignment because the left and right sides have a different number of elements.

It looks like inside your function, in these lines dS = ((-beta*(B/(B+k))*S(tt) + ub*(S(tt)+I(tt)+R(tt)) - ud*S) * dt)'; dI = ...

4일 전 | 0

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Invalid Expression with plotting t

Your code works after I fix two typos: dt=0.01; h=0.1; w=0.1; to=2.5; t=0:dt:10; r=h*exp(-((t-to).^2)/w^2); plot(t,r,'b',...

Invalid Expression with plotting t

Your code works after I fix two typos: dt=0.01; h=0.1; w=0.1; to=2.5; t=0:dt:10; r=h*exp(-((t-to).^2)/w^2); plot(t,r,'b',...

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How to use REGRESSION & INTERPOLATION ?

I don't think you need interpolation for this task. Do you have the Statistics and Machine Learning Toolbox? You could fit a no...

How to use REGRESSION & INTERPOLATION ?

I don't think you need interpolation for this task. Do you have the Statistics and Machine Learning Toolbox? You could fit a no...

4일 전 | 0

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How to have a x-axis with repeating values (non-unique)

I have not seen a plot of this style. It's a bit confusing to me. I'm curious what the color background regimes are. Training, t...

How to have a x-axis with repeating values (non-unique)

I have not seen a plot of this style. It's a bit confusing to me. I'm curious what the color background regimes are. Training, t...

6일 전 | 0

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errors using Numerical Integration

I see three errors: (1) You need elementwise division instead of matrix division: y = @(x) 1./(sqrt(1+x.^4)); % note the adde...

errors using Numerical Integration

I see three errors: (1) You need elementwise division instead of matrix division: y = @(x) 1./(sqrt(1+x.^4)); % note the adde...

8일 전 | 1

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Uniformly distributed random variables

The main reason your output looks like this is that you are only generating ONE random value for each resistor -- and then recal...

Uniformly distributed random variables

The main reason your output looks like this is that you are only generating ONE random value for each resistor -- and then recal...

8일 전 | 0

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pseudo code for all n values

Assuming that what you wanted was alternating pattern of 1's and 0's, regardless of how large n is, then this should do what you...

pseudo code for all n values

Assuming that what you wanted was alternating pattern of 1's and 0's, regardless of how large n is, then this should do what you...

9일 전 | 1

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How to avoid "doubling up" in a RNG?

Here is one way to do what I think you mean: x = zeros(10,10); % For M and N, select 6 random integers from 1:10. M = randp...

How to avoid "doubling up" in a RNG?

Here is one way to do what I think you mean: x = zeros(10,10); % For M and N, select 6 random integers from 1:10. M = randp...

10일 전 | 1

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Call matlab from STATA

I haven't run MATLAB from the command line in probably 20 years, but I think I would try putting the whole try-catch structure i...

Call matlab from STATA

I haven't run MATLAB from the command line in probably 20 years, but I think I would try putting the whole try-catch structure i...

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Save a double array to a text file

Regardless of what is displayed to the MATLAB command window (in your case, the default format, it seems), an array of type doub...

Save a double array to a text file

Regardless of what is displayed to the MATLAB command window (in your case, the default format, it seems), an array of type doub...

10일 전 | 0

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Doubt in a product erro

The reason has to do with the accuracy of floating-point math on a binary computer. I suggest you read this question and answer,...

Doubt in a product erro

The reason has to do with the accuracy of floating-point math on a binary computer. I suggest you read this question and answer,...

11일 전 | 1

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How to only show part of a plot

You can set the axis limits of a plot using the xlim (and ylim and zlim) command. If that is not what you meant, I suggest you ...

How to only show part of a plot

You can set the axis limits of a plot using the xlim (and ylim and zlim) command. If that is not what you meant, I suggest you ...

12일 전 | 0

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using logical functions to display arrays

When x is a vector, then if x < 10 is interpreted as "if all elements of x are less than 10". Your if statement is never enter...

using logical functions to display arrays

When x is a vector, then if x < 10 is interpreted as "if all elements of x are less than 10". Your if statement is never enter...

12일 전 | 0

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Cody Problem 14. Find the numeric mean of the prime numbers in a matrix.

After you correct the problem that @Geoff Hayes pointed out in his comment, you still have a mathematical one. out = sum/2 is ...

Cody Problem 14. Find the numeric mean of the prime numbers in a matrix.

After you correct the problem that @Geoff Hayes pointed out in his comment, you still have a mathematical one. out = sum/2 is ...

14일 전 | 0

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Simpsons rule function error

In this line of code: x=x(1)+h*(2*k-1); you have set x to a scalar value, so when you try to access x(2) in this line of code:...

Simpsons rule function error

In this line of code: x=x(1)+h*(2*k-1); you have set x to a scalar value, so when you try to access x(2) in this line of code:...

15일 전 | 1

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What Shall I need to add while calling file having numerical digits (e.g. -1,-2)?

You may want to try the functional form instead. load('Histories/IND.X0kY-1k.CXY.sema'); Also, what variables are in your work...

What Shall I need to add while calling file having numerical digits (e.g. -1,-2)?

You may want to try the functional form instead. load('Histories/IND.X0kY-1k.CXY.sema'); Also, what variables are in your work...

16일 전 | 0

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clustering based on a custom function

I can't say that I have spent enough time with your code to fully understand it. But, I notice the following. Inside the loop o...

clustering based on a custom function

I can't say that I have spent enough time with your code to fully understand it. But, I notice the following. Inside the loop o...

17일 전 | 0

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data from one array to another

I can't tell what you intend to get from this expression [x(j),:] which is not valid MATLAB syntax. x(j) is the j-th element o...

data from one array to another

I can't tell what you intend to get from this expression [x(j),:] which is not valid MATLAB syntax. x(j) is the j-th element o...

18일 전 | 0

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How do i get three colums as output?

t = data(:,[93,92,91]); will be the the last three columns from data, in reverse order.

How do i get three colums as output?

t = data(:,[93,92,91]); will be the the last three columns from data, in reverse order.

19일 전 | 1

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Placing none NaN values from a matrix to another

A = [NaN NaN NaN 3 0 NaN NaN 1; NaN 2 NaN 6 1 NaN NaN NaN; 5 NaN NaN 2 NaN NaN NaN 1]; B = [ 1 2 3 4 5 6 7 8; 8 7 6 5 4 3 2 1; ...

Placing none NaN values from a matrix to another

A = [NaN NaN NaN 3 0 NaN NaN 1; NaN 2 NaN 6 1 NaN NaN NaN; 5 NaN NaN 2 NaN NaN NaN 1]; B = [ 1 2 3 4 5 6 7 8; 8 7 6 5 4 3 2 1; ...

19일 전 | 0

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why i get Array indices must be positive integers or logical values.

In this line z(length(R),length(R)-1) = -R(length(R)-1) if the user enters a resistance vector that is length 1, then you try...

why i get Array indices must be positive integers or logical values.

In this line z(length(R),length(R)-1) = -R(length(R)-1) if the user enters a resistance vector that is length 1, then you try...

19일 전 | 0

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Error in code, "Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses. "

You seem to have a rogue t at the end of your expression. If you get rid of that, then ... Td=1/55*(20*pi*sin(1/11*pi*t)+33*exp...

Error in code, "Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses. "

You seem to have a rogue t at the end of your expression. If you get rid of that, then ... Td=1/55*(20*pi*sin(1/11*pi*t)+33*exp...

19일 전 | 0

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Replacing single values in a matrix with 1x09 doubles

I think this does what you want, using a straightforward loop. You could loop this over values of N = 1:6, if what you want to ...

Replacing single values in a matrix with 1x09 doubles

I think this does what you want, using a straightforward loop. You could loop this over values of N = 1:6, if what you want to ...

21일 전 | 1

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Unable to perform assignment because the left and right sides have a different number of element

You need to use K(n,:)=A; and L(n,:)=A; to assign the row vector A to a row of K or L. K(n) is a single element, using line...

Unable to perform assignment because the left and right sides have a different number of element

You need to use K(n,:)=A; and L(n,:)=A; to assign the row vector A to a row of K or L. K(n) is a single element, using line...

22일 전 | 1