Answered

How to calculate the area between two curves

Try the following : I've used one of the many interpolation routines, but I notice that you have not sorted your (x2, y2) data, ...

How to calculate the area between two curves

Try the following : I've used one of the many interpolation routines, but I notice that you have not sorted your (x2, y2) data, ...

19 days ago | 0

| accepted

Answered

Range-Kutta solving error.

Seems fine to me: Let's try to check the analhytical solution, and also find the derivative of F(t). That's pretty easy: clc...

Range-Kutta solving error.

Seems fine to me: Let's try to check the analhytical solution, and also find the derivative of F(t). That's pretty easy: clc...

20 days ago | 1

Answered

Why when I try to LLSQ fit to a quadratic the line of best fit has so many lines

A simple fix is to replace your independent variable with a variable ordered from min to max % xx = x xx = linspace(50, 230)';...

Why when I try to LLSQ fit to a quadratic the line of best fit has so many lines

A simple fix is to replace your independent variable with a variable ordered from min to max % xx = x xx = linspace(50, 230)';...

3 months ago | 1

| accepted

Answered

Filling the area between curves (loglog)

I too had some difficulty to do this elgantly. I changed the name of your data file, and commented out the material that didn't ...

Filling the area between curves (loglog)

I too had some difficulty to do this elgantly. I changed the name of your data file, and commented out the material that didn't ...

5 months ago | 0

Answered

How to solve the riccati equations in matlab

Well, if Google translate is accurate, you seem to want to solve for the matrix Q. I'm assuming that everything is a matrix w...

How to solve the riccati equations in matlab

Well, if Google translate is accurate, you seem to want to solve for the matrix Q. I'm assuming that everything is a matrix w...

5 months ago | 1

| accepted

Answered

How to solve the riccati equations in matlab

Do you have the control toolbox? I suspect that you could use are.m and related friends.

How to solve the riccati equations in matlab

Do you have the control toolbox? I suspect that you could use are.m and related friends.

5 months ago | 0

Answered

How to find time constants from given 2+ order transfer function?

If you just want to display the transfer function in time-constant form, you can do the following: s = tf('s'); k = 45; % an...

How to find time constants from given 2+ order transfer function?

If you just want to display the transfer function in time-constant form, you can do the following: s = tf('s'); k = 45; % an...

5 months ago | 1

Answered

i am trying to made a code to int the numbers of time i want

Remove the z=x^2 from the loop. syms x n y z a; n= 5 z=x^2; for y=1:n z=int(z) end

i am trying to made a code to int the numbers of time i want

Remove the z=x^2 from the loop. syms x n y z a; n= 5 z=x^2; for y=1:n z=int(z) end

9 months ago | 1

| accepted

Answered

How to obtain regression polynomial equation with more than 2 independent variables with degree 5.

OK, the fitting is easy, the plotting less so. Since you didn't give us too many hints, not did you give us any data to work wit...

How to obtain regression polynomial equation with more than 2 independent variables with degree 5.

OK, the fitting is easy, the plotting less so. Since you didn't give us too many hints, not did you give us any data to work wit...

10 months ago | 2

| accepted

Answered

Text keeps going behind topographic map

Your mountains are covering the text (as they should). So you need to write your text above the highest peak, so that it is seen...

Text keeps going behind topographic map

Your mountains are covering the text (as they should). So you need to write your text above the highest peak, so that it is seen...

10 months ago | 0

| accepted

Answered

function to produce line graph

I would strongly suggest you don't try a polynomial fit here. From the context (which you neglected to tell us), I suspect that ...

function to produce line graph

I would strongly suggest you don't try a polynomial fit here. From the context (which you neglected to tell us), I suspect that ...

10 months ago | 0

| accepted

Answered

creating a transfer function from a determinant

How about: [num,den] = numden(G_vel) G_vel_tf = tf(sym2poly(num), sym2poly(den))

creating a transfer function from a determinant

How about: [num,den] = numden(G_vel) G_vel_tf = tf(sym2poly(num), sym2poly(den))

1 year ago | 0

| accepted

Answered

Problem Calculating Nonlinear Indefinite Integral

Since you neglected to tell us values for a and b, I'll just set them to a=2 and b=1. You have also two definitions for g(x), so...

Problem Calculating Nonlinear Indefinite Integral

Since you neglected to tell us values for a and b, I'll just set them to a=2 and b=1. You have also two definitions for g(x), so...

1 year ago | 0

| accepted

Answered

Plot electric potential distribution

Well I kind of get what you want, but you do seem to have a singularity at the origin when r=0. p = 1; sig = 1; % constants th...

Plot electric potential distribution

Well I kind of get what you want, but you do seem to have a singularity at the origin when r=0. p = 1; sig = 1; % constants th...

1 year ago | 1

Answered

fitting scatter data into multiple cosine functions

Yes, but it is always tricky to fit such sinusoids without good starting estimates. I'm going to use lsqcurvefit from the optimi...

fitting scatter data into multiple cosine functions

Yes, but it is always tricky to fit such sinusoids without good starting estimates. I'm going to use lsqcurvefit from the optimi...

1 year ago | 0

Question

Is the Moving Variance block in Simulink vectorised?

I'm using the Moving Variance block in Simulink and it seems to be giving unexplained results for vectorised (muxed) inputs. My ...

1 year ago | 1 answer | 0

Answered

2D Convolution - Sobel Filter. What is wrong?

Here's my (old) code for a sobel filter: img = imread('Davis_Hall.jpg'); % 'Davis_Hall.jpg':color image X =double(rgb2gray(i...

2D Convolution - Sobel Filter. What is wrong?

Here's my (old) code for a sobel filter: img = imread('Davis_Hall.jpg'); % 'Davis_Hall.jpg':color image X =double(rgb2gray(i...

1 year ago | 0

Answered

Related to Matlab Step Comment

You are possibly confusing the closed loop response with the open loop. The closed loop gain is 1/4, so the error is 1-1/4 = 3/4...

Related to Matlab Step Comment

You are possibly confusing the closed loop response with the open loop. The closed loop gain is 1/4, so the error is 1-1/4 = 3/4...

1 year ago | 1

| accepted

Answered

how to solve matrix differential equation

Here's my attempt: M = [ 97227/21875, 0, 82269/109375, 0, 67311/43750, 0, -97227/218750, 0; ... 0, 97227/21875, 0, 822...

how to solve matrix differential equation

Here's my attempt: M = [ 97227/21875, 0, 82269/109375, 0, 67311/43750, 0, -97227/218750, 0; ... 0, 97227/21875, 0, 822...

1 year ago | 1

Answered

From Fir2 output to transfer function

tr_fun should be a discrete transfer function, (not continuous) say tr_fun=tf(BF,1,1); % Generate a DISCRETE Transfer Function...

From Fir2 output to transfer function

tr_fun should be a discrete transfer function, (not continuous) say tr_fun=tf(BF,1,1); % Generate a DISCRETE Transfer Function...

1 year ago | 0

Answered

How to identify corners of data plotted to estimate data between corners

How about using interp1 with the 'pchip' option? You did speculate the interpolation is overly complex, but then again it is onl...

How to identify corners of data plotted to estimate data between corners

How about using interp1 with the 'pchip' option? You did speculate the interpolation is overly complex, but then again it is onl...

1 year ago | 1

| accepted

Answered

How I can find co ordinates of intersection of two curves ?

Oh, looks like this is a common question: See (from 2016)https://au.mathworks.com/matlabcentral/answers/318475-how-to-find-the-i...

How I can find co ordinates of intersection of two curves ?

Oh, looks like this is a common question: See (from 2016)https://au.mathworks.com/matlabcentral/answers/318475-how-to-find-the-i...

1 year ago | 1

Answered

Iterative Method of solving multiple variables without using the curvefit tool

Here's my attempt at fitting uusing lsqcurvefit from the optimisation toolbox. First I generate some synthetic data to subsequ...

Iterative Method of solving multiple variables without using the curvefit tool

Here's my attempt at fitting uusing lsqcurvefit from the optimisation toolbox. First I generate some synthetic data to subsequ...

1 year ago | 0

Answered

how can i calculate the angle of each gradient and x axis?

You could always differentiate to get the slope and then take the arc-tan. syms x real s = 1/(1 + exp(-2*(x-4))) dsdx = dif...

how can i calculate the angle of each gradient and x axis?

You could always differentiate to get the slope and then take the arc-tan. syms x real s = 1/(1 + exp(-2*(x-4))) dsdx = dif...

1 year ago | 0

Answered

Extracting the daily time series from a text file to a single column

A quick hack is: fname = 'D59.txt' Flow = []; fid=fopen(fname); Yr = 2012; R = []; while 1 tline = fgetl(fi...

Extracting the daily time series from a text file to a single column

A quick hack is: fname = 'D59.txt' Flow = []; fid=fopen(fname); Yr = 2012; R = []; while 1 tline = fgetl(fi...

1 year ago | 0

| accepted

Answered

How to Rearrange data?

Try something like the following: First read in the data file (which I've called numData.txt). I've used your test data above. ...

How to Rearrange data?

Try something like the following: First read in the data file (which I've called numData.txt). I've used your test data above. ...

1 year ago | 0

| accepted

Answered

(Food for Thought) Peak Detection on ECG signal

OK, here's my (ugly) solution (withou using findpeaks). I've re-named your data set, and did some pre-processig. load ecg y =...

(Food for Thought) Peak Detection on ECG signal

OK, here's my (ugly) solution (withou using findpeaks). I've re-named your data set, and did some pre-processig. load ecg y =...

1 year ago | 0

| accepted

Answered

Simulating a FIR filter

Use the filter command. In this case your denominator, (A), coefficients are just 1. x = [ 0 0 0 1 1 1 1 1 ]' % input b = [...

Simulating a FIR filter

Use the filter command. In this case your denominator, (A), coefficients are just 1. x = [ 0 0 0 1 1 1 1 1 ]' % input b = [...

1 year ago | 1

| accepted

Answered

Obtain input knowing output and transfer function

Since you have a simple transfer function, here's what I would do. (1) First generate some data that we will subsequently try ...

Obtain input knowing output and transfer function

Since you have a simple transfer function, here's what I would do. (1) First generate some data that we will subsequently try ...

1 year ago | 0