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Daniel Pollard


Last seen: 5 días ago
87 total contributions since 2020

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Answered
While loop for testing the end of vector (Matlab)
If you know that it's 1-dimensional, you can use numel(vector) which returns the length of your vector. Also useful to know i...

13 días ago | 1

Answered
Finding numChanges in array
Replace for i=1;length(V) with for ii = 1:length(V) The semicolon -> colon is a typo I suspect, and i has a built in value s...

13 días ago | 1

| accepted

Answered
How to plot a graph in nm
Your method works perfectly well. An alternative option would be theta = 10 wavelength = [500:10:700] m = 1 d = (m.*waveleng...

25 días ago | 1

| accepted

Answered
Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 10-by-10. not sure why i am getting this error
Biot_top is size 10x10. dtMat(1,j) is size 1x1. This means the LHS of your line is 1x1, and the RHS is 10x10, so you can't make ...

26 días ago | 0

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Answered
How to create one errorbar for multiple data points?
If I understand you right, could you do something like figure; hold on plot(x, y, 'bx') errorbar(mean(x), mean(y), std(y), 'k...

26 días ago | 1

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Answered
Graph with similar axis value with the value given
You want xticks and yticks. As a note: you need the vectors to be in ascending order, and your second tickmark vector isn't. so...

27 días ago | 0

Answered
Does MathWorks have software for rocket trajectory modeling at supersonic speed?
The Aerospace toolbox is likely to be the closest to what you want. I don't use it so don't know much about it, but it seems to ...

27 días ago | 0

Answered
converting degrees and radian
Something like option = input("Type A for degree to radians, and B for radians to degrees: ", 's') if option == "A" degs ...

28 días ago | 0

Answered
How can I plot histogram?
Simply googling "matlab histogram" would have answered your question. That link is for the documentation for histogram. histog...

alrededor de 1 mes ago | 0

Answered
Double for loop is not working properly
k will take the values [1 2]. For the first iteration of k, it stores data{1,1}(:,14) in ch{1,n}. The second time around, it wil...

alrededor de 1 mes ago | 0

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Answered
Uneven linspacing of an array
If I understand right, you have a vector len, and you want to have a vector x such that diff(x)=len. In that case, you can use t...

alrededor de 1 mes ago | 0

Answered
Problem with running a Matlab code.
Clear your variables by putting the command clear at the start of your programme. It's almost certainly holding onto variable...

alrededor de 1 mes ago | 0

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Answered
How Create a vector given size(N) and the value of the max element(M)?
Are those the only conditions? linspace(1, M, N) has N values which range from 1 to M.

alrededor de 1 mes ago | 0

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Answered
Using sample code but returning a blank plot
You create a label and a title for a plot, but at no point do you feed it actual data to plot. Why would it do anything but prod...

alrededor de 1 mes ago | 0

Answered
Create a Slanted Linspace Matrix
If you have the signal processing toolbox, the buffer command will do exactly what you want. If not, something like x = linsp...

alrededor de 1 mes ago | 0

Answered
log ticks on Y-axis
set(gca, 'YScale', 'log') Is this what you mean?

alrededor de 1 mes ago | 0

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Answered
error message how to solve !?
The error message is exactly what it says. You defined a function, which is not defined if one of your inputs is a function hand...

alrededor de 1 mes ago | 0

Answered
MATLAB isn't working to generate figures
Use hold on and hold off when generating figures. I've not used imshow before, but I'll guess that each time you generate a figu...

alrededor de 1 mes ago | 0

Answered
How to add a NaN row at the beginning columns of a table?
for jj = 1:5 A(:,jj) = [NaN([jj 1]); B(1:end-jj)] A(T.id(1:end) ~= [NaN([jj 1]); T.id(1:end-jj)], jj) = NaN; end I h...

alrededor de 2 meses ago | 1

| accepted

Answered
signal to noise ratio (SNR)
According to the documentation, "r = snr(x,y) returns the signal-to-noise ratio (SNR) in decibels of a signal, x, by computing ...

alrededor de 2 meses ago | 0

| accepted

Answered
How can I get archived documentation for a R2012b release?
As per the other answer, 2012b doesn't have easily accessed documentation. I have found, however, the 2012b release notes in thi...

alrededor de 2 meses ago | 0

Answered
How to Integrate ?
Wolfram alpha is useful here to show you what can be done. If you click that link you'll see that I asked it to do which is ...

alrededor de 2 meses ago | 0

Answered
Min and max value of many results
Good news! Matlab has built in min and max commands. So it's pretty straightforward to define them and store them in a vector: ...

alrededor de 2 meses ago | 1

Question


Is it possible to include LaTeX expressions as text in my code?
I have a piece of code, where some of the variables can have their values chosen by me as and when I want. The values have very ...

alrededor de 2 meses ago | 2 answers | 0

2

answers

Answered
What is the difference between matlab download R2020a and R2020b?
Here are the release notes for 2020b. There likely isn't much to change for most people, when I updated from 2020a to 2020b I di...

alrededor de 2 meses ago | 0

| accepted

Answered
Index in position 1 is invalid. Array indices must be positive integers or logical values. (Slution of equation of motion with runge kutta 4)
t(1), q(1) and dqdt(1) are all zero. Matlab indexing starts at 1, so when you assign k_11 = y1_2nd(t(i),q(i),dqdt(i)) it trie...

alrededor de 2 meses ago | 0

Answered
I want the graph of the function only show the part where x>0
You want xlim. Give it one limit and it can calculate the other, or use xlim(0, length(y)).

alrededor de 2 meses ago | 1

Answered
max and min row from an array
The built in min and max commands have the ability to return the index of the largest and smallest values in an array. The docum...

alrededor de 2 meses ago | 0

Answered
How to change dot's place in fractional number
Multiply by 100? x1 = 0.25; x2 = x1 * 100; disp(x2) 25

alrededor de 2 meses ago | 1

| accepted

Question


How do I find out what specifically is causing the error "Matrix is close to singular or badly scaled" in the sgolay function?
I'm using the sgolay function from the Signal Processing toolbox to calculate some derivatives. The function is inside a loop as...

alrededor de 2 meses ago | 1 answer | 0

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