Answered

Error calculating vector dot product when vector elements are variables

The Symbolic Math Toolbox makes the (usually appropriate) assumption that the variables are complex. Force them to be real by...

Error calculating vector dot product when vector elements are variables

The Symbolic Math Toolbox makes the (usually appropriate) assumption that the variables are complex. Force them to be real by...

14 days ago | 1

| accepted

Answered

Hill plot for binding of a ligand L to a protein

There’s too much missing information to provide a specific response. The is not defined in the second equation, and there is n...

Hill plot for binding of a ligand L to a protein

There’s too much missing information to provide a specific response. The is not defined in the second equation, and there is n...

14 days ago | 0

Answered

Help extracting rows based on unique column 1 data

There is a lot I don’t unerstand about this problem. However, if you want to find the unique occurrences of each of the ‘talp...

Help extracting rows based on unique column 1 data

There is a lot I don’t unerstand about this problem. However, if you want to find the unique occurrences of each of the ‘talp...

15 days ago | 0

| accepted

Answered

How to manage weird black line on Y axis outside the figure itself

I cannot reproduce what you’re seeing. I don’t understand the temperature data after about 2013 (I have no idea what the dens...

How to manage weird black line on Y axis outside the figure itself

I cannot reproduce what you’re seeing. I don’t understand the temperature data after about 2013 (I have no idea what the dens...

15 days ago | 0

| accepted

Answered

Fourier Transformation of a portion of an audio signal is only resulting in a horizontal line, why?

Consider: R = length(r); u = pow2(nextpow2(R)); % Transform length ffR = fft(R,u); % Fourier Transform %fR = (0:R-1)*(Fs/R...

Fourier Transformation of a portion of an audio signal is only resulting in a horizontal line, why?

Consider: R = length(r); u = pow2(nextpow2(R)); % Transform length ffR = fft(R,u); % Fourier Transform %fR = (0:R-1)*(Fs/R...

16 days ago | 1

| accepted

Answered

Extract data corresponding to particular dates

Therea re likely several ways to do this. Using ismember — DT = table(datetime('now')+days(0:364).', 'VariableNames',{'Date...

Extract data corresponding to particular dates

Therea re likely several ways to do this. Using ismember — DT = table(datetime('now')+days(0:364).', 'VariableNames',{'Date...

16 days ago | 0

| accepted

Answered

Colouring patches from a voronoi tessalation

It may be possible to close the exterior of the plot using the boundary function. I was able to do that reasonably well with: ...

Colouring patches from a voronoi tessalation

It may be possible to close the exterior of the plot using the boundary function. I was able to do that reasonably well with: ...

16 days ago | 1

Answered

Determine -3db gain on Freq- gain plot

Use: find(diff(sign(gain-Gain_3db))) or something similar, to find the indices of all the points where the curve equals the s...

Determine -3db gain on Freq- gain plot

Use: find(diff(sign(gain-Gain_3db))) or something similar, to find the indices of all the points where the curve equals the s...

16 days ago | 1

| accepted

Answered

Extract curve/surface from an 2-D area of points not equivalently spaced

I am not certain what result you want. The Signal Processing Toolbox envelope funciton is one option, and since I am familiar...

Extract curve/surface from an 2-D area of points not equivalently spaced

I am not certain what result you want. The Signal Processing Toolbox envelope funciton is one option, and since I am familiar...

16 days ago | 0

| accepted

Answered

How to find tangent line of curve

That plot actually looks familiar! See: How to draw a tangent line on a curve for one approach. (That result used the inflec...

How to find tangent line of curve

That plot actually looks familiar! See: How to draw a tangent line on a curve for one approach. (That result used the inflec...

17 days ago | 0

Answered

Bode Plot and Corner Frequency

The ‘sys1’ and ‘sys2’ transfer functions are actually improper, wince with a denominator of 1, they are infinite differentiators...

Bode Plot and Corner Frequency

The ‘sys1’ and ‘sys2’ transfer functions are actually improper, wince with a denominator of 1, they are infinite differentiators...

17 days ago | 1

| accepted

Answered

plot a data????

It appears to run correctly, unless there is a quesiton you are not stating. There are only 4 columns in ‘A’ so this threw th...

plot a data????

It appears to run correctly, unless there is a quesiton you are not stating. There are only 4 columns in ‘A’ so this threw th...

17 days ago | 0

Answered

Fourier series of any function

I am in no way certain what you want. Calculating a numerical transform is straightforward, however calculating a symbolic ve...

Fourier series of any function

I am in no way certain what you want. Calculating a numerical transform is straightforward, however calculating a symbolic ve...

17 days ago | 0

Answered

Plot a shadow between to lines for a current figure without legend

Add a patch call — figure le=[1,2,3]; x=[0 5 15]; y=2*x; for i =1 : length(x) txt = ['$\alpha_1$ = ',num2str(le(1,i))...

Plot a shadow between to lines for a current figure without legend

Add a patch call — figure le=[1,2,3]; x=[0 5 15]; y=2*x; for i =1 : length(x) txt = ['$\alpha_1$ = ',num2str(le(1,i))...

17 days ago | 1

| accepted

Answered

Plotting shaded area in matlab

See this File Exchange search for hatch, then choose the function that works best in your intended appplication for it.

Plotting shaded area in matlab

See this File Exchange search for hatch, then choose the function that works best in your intended appplication for it.

17 days ago | 0

| accepted

Answered

What are the graphics drivers with known issues?

I have never seen such a list, or have ever seen this issue being mentioned here previously. Someone from MathWorks needs to po...

What are the graphics drivers with known issues?

I have never seen such a list, or have ever seen this issue being mentioned here previously. Someone from MathWorks needs to po...

17 days ago | 0

| accepted

Answered

smooth curve smooth curve

That appears to me to be a fft result after using the fftshift function on it. Each of the ‘peaks’ is a different frequency com...

smooth curve smooth curve

That appears to me to be a fft result after using the fftshift function on it. Each of the ‘peaks’ is a different frequency com...

17 days ago | 0

Answered

Parsing variable in table

Try something like this — T1 = table(datetime(['2021-02-01 09:00:00' '2021-02-01 09:01:00' '2021-02-01...

Parsing variable in table

Try something like this — T1 = table(datetime(['2021-02-01 09:00:00' '2021-02-01 09:01:00' '2021-02-01...

18 days ago | 0

| accepted

Answered

How to do normal distribution for same data?

Try something like this — %Import front sonar for 30cm: sonar_F_030 = readtable('https://www.mathworks.com/matlabcentral/answ...

How to do normal distribution for same data?

Try something like this — %Import front sonar for 30cm: sonar_F_030 = readtable('https://www.mathworks.com/matlabcentral/answ...

18 days ago | 0

| accepted

Answered

plotting multiple fitting graphs in a single graph

The code works as posted. If you want to plot both results on the same axes, that is straightforward. See the third figure —...

plotting multiple fitting graphs in a single graph

The code works as posted. If you want to plot both results on the same axes, that is straightforward. See the third figure —...

18 days ago | 0

Answered

Vertical Error bars from gauge accuracy

I am not certain what result you want. I ran the code, and the errorbar plot completely covers most of the rest of it, so in...

Vertical Error bars from gauge accuracy

I am not certain what result you want. I ran the code, and the errorbar plot completely covers most of the rest of it, so in...

18 days ago | 0

| accepted

Answered

must return a column vector

I am not certain what ‘ydot’ is supposed to be, however the element-wise multiplication is likely the problem. Use array mult...

must return a column vector

I am not certain what ‘ydot’ is supposed to be, however the element-wise multiplication is likely the problem. Use array mult...

18 days ago | 0

Answered

Boeing 747 transfer functions

That would seem to be the ‘A’ matrix of a state space model. Use the Control System Toolbox ss function (with the other necessa...

Boeing 747 transfer functions

That would seem to be the ‘A’ matrix of a state space model. Use the Control System Toolbox ss function (with the other necessa...

18 days ago | 1

Answered

Roots of a nonlinear equations system

Use the solve function — syms x y fcn = [-4*y^2 + 4*x - 4 == 0; 16*y^2 - 8*x*y ==0] S = solve(fcn) x = S.x y = S.y .

Roots of a nonlinear equations system

Use the solve function — syms x y fcn = [-4*y^2 + 4*x - 4 == 0; 16*y^2 - 8*x*y ==0] S = solve(fcn) x = S.x y = S.y .

18 days ago | 1

Answered

Write variable label on the Y-axis of graphs

Try this — figure plot(sort(rand(1,10)), rand(1,10), '-p') ylabel('$\tilde{H}_{H,2}^{H,1}$', 'Interpreter','latex', 'FontSiz...

Write variable label on the Y-axis of graphs

Try this — figure plot(sort(rand(1,10)), rand(1,10), '-p') ylabel('$\tilde{H}_{H,2}^{H,1}$', 'Interpreter','latex', 'FontSiz...

19 days ago | 1

Answered

Batch FFT operation on EMG data

I am not certain what you want to do. After you load the data and select the sections you want to analyse, convert the data i...

Batch FFT operation on EMG data

I am not certain what you want to do. After you load the data and select the sections you want to analyse, convert the data i...

19 days ago | 0

| accepted

Answered

Solving ODEs for chemical rate equations

Here is prototype code for integrating the solution for a different kinetic parameter estimation problem with four rate equation...

Solving ODEs for chemical rate equations

Here is prototype code for integrating the solution for a different kinetic parameter estimation problem with four rate equation...

19 days ago | 0

| accepted

Answered

finding the Column name of a matrix

I am not certain what you want to do. The equality comparison operator in MATLAB is the double-equal (==) operator — A = ra...

finding the Column name of a matrix

I am not certain what you want to do. The equality comparison operator in MATLAB is the double-equal (==) operator — A = ra...

19 days ago | 0

| accepted

Answered

Error using / matrix dimensions must agree

The ‘y’ expression is not a function of ‘x’. Correcting that (and assuming the independent variable is actually ‘ec’) — ec ...

Error using / matrix dimensions must agree

The ‘y’ expression is not a function of ‘x’. Correcting that (and assuming the independent variable is actually ‘ec’) — ec ...

19 days ago | 1

| accepted

Answered

Why is the derivative of a matrix not of the same order?

Use the gradient function instead of diff.

Why is the derivative of a matrix not of the same order?

Use the gradient function instead of diff.

19 days ago | 1

| accepted