the cyclist

Last seen: Today

4,506 2011 이후 총 참여 횟수

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...

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...

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...

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...

1일 전 | 0

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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...

1일 전 | 1

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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.

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 = ...

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',...

4일 전 | 0

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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...

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...

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...

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...

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...

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...

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...

10일 전 | 0

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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...

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,...

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 ...

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...

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 ...

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:...

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...

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...

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...

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.

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; ...

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...

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...

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 ...

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...

22일 전 | 1