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njj1


National Institute of Standards and Technology

38 total contributions since 2016

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Answered
Date numbers in double to datestring matrix
You cannot put date strings and numerical data into a single matrix. You could use a cell if you wanted. For example: X_new...

9 months ago | 0

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Answered
How do I make an array of elapsed times?
OK, so this sounds like it's inside a for loop, in which case you could try something like this: for runs=number_of_runs:-1...

9 months ago | 0

Answered
How to display velocity for each loop at 20 seconds?
You have an error in your code: fprint('%.0m/s\n', vj(,2) This code should work for you: Time=20; %Time the jumper ...

9 months ago | 0

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Answered
How to solve non linear equation for one variable?
If you want to solve for multiple values of temp and yieldstress, you will have to use a for loop. for i=1:numel(temp) ...

9 months ago | 1

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Answered
How to plot a pdf and cdf for my code
If you want to compute the pdf for a normal distribution over a range of values, you must input a vector of possible values sort...

9 months ago | 0

Answered
Finding the Maximum of 6 matrices
You can use max(X,[],dim) to specify the dimension from which to compute the maximum value. For example, if you let dim=2, then ...

9 months ago | 0

Answered
How do I make a gradient for my data
The gradient function in Matlab takes in two main arguments: the independent variable(s) step size and the data as a function of...

9 months ago | 0

Submitted


sanc(x,L,mu,delta)
Self Adaptive Noise Cancellation

9 months ago | 1 download |

Submitted


minEntropyDeconv(x,L,maxIter)
This function develops a minimum entropy deconvolution filter for a sequence x

9 months ago | 1 download |

Answered
How would i run different events from the same .txt file?
You should import the entire matrix and then begin the splitting process. A = dlmread('Nest.txt',' '); %this assumes there ...

9 months ago | 0

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Answered
In a matrix how to replace zero by NaN.?
Try this: A(A==0) = NaN;

9 months ago | 0

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Answered
this is my equation using matlab , i can't get it manually.
This looks like it's the distance from each (x,y) pair to every other (x,y) pair. A_{i,j} = \sqrt{(x_i - x_j)^2}, where x = (...

9 months ago | 0

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Answered
Classification of a whole matrix
You could turn the matrix into a vector (e.g., X = X(:)), then use the resulting vector as input to the classification learner. ...

9 months ago | 1

Answered
sorting the outputs of clusters
What do you mean "sort". You could save them to different variables. For example, if you main matrix is called X and you have cl...

9 months ago | 0

Answered
How to write a range of numbers in MATLAB?
ranges = [0,12,20:10:110]; %end points of requested speeds for i = 1:numel(ranges)-1 v{i} = V((V>ranges(i) & (V<=ra...

9 months ago | 0

Answered
Kmeans clustering in k=10
1) Randomly initialize 10 cluster centroids. This can be done by simply randomly selecting 10 points from your dataset. 2) Co...

9 months ago | 0

Answered
Help graphing this equation
You need to have an independent variable (e.g., when plotting y vs. x, x is the independent variable). So if you want to plot ep...

9 months ago | 1

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Answered
How to write a range of numbers in MATLAB?
v1 = V((V>0) & (V<=60)); numV1 = numel(v1); v2 = V((V>60) & (V<=80)); numV2 = numel(v2); v3 = V((V>80) & (V<=110)); numV...

9 months ago | 0

Answered
How to assign fields from a Struct into every 5th column of a Matrix
It is often helpful to step through your code and examine the variables at each step. One problem could be the shape of your var...

9 months ago | 0

Answered
What is the easiest way to create a textbox?
The annotation command is quite useful and can save time for sure. Unfortunately, it does not have any 'top right' commands, so ...

9 months ago | 0

Answered
How to compare two different sample size on basis of datapoints in same interval?
You can use a histogram, but with the property 'Normalization' set to 'pdf'. This will plot an estimated probability density fun...

9 months ago | 0

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Answered
Merging array into matrix of unequal size
Why not create the matrix M such that it's size is [numel(x), num_of_desired_columns]? For example, if num_of_desired_columns = ...

9 months ago | 0

Answered
Math problem for code
Try using diff(S,1,dim) to get the difference between sequential elements in the matrix S. Each entry in diff(S) is (x_{n} - x_{...

10 months ago | 0

| accepted

Question


Why doesn't 'HeaderLines' work in the readtable command?
I am importing some excel files into Matlab using the readtable command. There are a couple of header lines in the file that I w...

10 months ago | 2 answers | 0

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answers

Answered
Warning: Matrix is singular to working precision. how to solve?
There are ways of getting around a singular matrix, but they are a little ad hoc. have you tried QR decomposition ([Q,R] = qr(A)...

10 months ago | 0

Answered
Shading between two curves
You can try using the "fill" function (could also use "patch"). Just off the top of my head, if you can compute the area between...

10 months ago | 0

Answered
How to compare the values of 2 arrays vs each other?
What do you mean by "similar"? If you want simply see the number of entries that are the same, then this could do the trick: ...

11 months ago | 0

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Answered
How to keep an element fixed until it fits a condition?
Can you clean up the code a little? It's not clear where the loops begin and end... A couple more questions/comments. 1) How...

11 months ago | 0

Answered
I would like to know if my function is correct
You actually need not go through the whole for loop to do this. First off, I assume the number of entries in x is equal to the n...

11 months ago | 0

Answered
How to see how a dataset changes over time with PCA.
It's hard to know exactly what you are hoping to achieve here. When using pca(x) in Matlab, we are assuming that "rows of X corr...

11 months ago | 0

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