Answered

How to implement a Matlab code that choose from random questions?

You can use randperm() to generate a sequence of random numbers without repetition. For example, if you have a database of 100 q...

How to implement a Matlab code that choose from random questions?

You can use randperm() to generate a sequence of random numbers without repetition. For example, if you have a database of 100 q...

environ 7 heures ago | 1

Answered

Are handle classes the fastest containers?

There is a performance overhead for using handle classes if you try to access its properties repeatedly. This thread summarizes ...

Are handle classes the fastest containers?

There is a performance overhead for using handle classes if you try to access its properties repeatedly. This thread summarizes ...

environ 7 heures ago | 0

Answered

What function to use to solve an equation for a variable that's on both sides of the equation?

Also see solve() function: https://www.mathworks.com/help/symbolic/solve.html.

What function to use to solve an equation for a variable that's on both sides of the equation?

Also see solve() function: https://www.mathworks.com/help/symbolic/solve.html.

environ 7 heures ago | 0

Answered

Saving a 1xn Bar plot as a jpg

saveas() is quite an old function and not suitable for getting high-quality images. If you are using a recent version of MATLAB,...

Saving a 1xn Bar plot as a jpg

saveas() is quite an old function and not suitable for getting high-quality images. If you are using a recent version of MATLAB,...

environ 7 heures ago | 0

Answered

The value of the RMSE is hight

You can increase the neurons in hidden layers of your ANN model or increase the number of hidden layers to decrease RMSE. Howeve...

The value of the RMSE is hight

You can increase the neurons in hidden layers of your ANN model or increase the number of hidden layers to decrease RMSE. Howeve...

environ 7 heures ago | 0

| accepted

Answered

How to plot this on a graph

There is no 'x' in your expression inside symsum(). I guess you are tyring to plot taylor series of exp(x). Try this syms n x ...

How to plot this on a graph

There is no 'x' in your expression inside symsum(). I guess you are tyring to plot taylor series of exp(x). Try this syms n x ...

environ 7 heures ago | 0

| accepted

Answered

plot two time series datasets from different years on the same plot ignoring the year

Refer to the answer here: https://www.mathworks.com/matlabcentral/answers/440517-how-to-remove-period-stamp-in-datetime-plot Y...

plot two time series datasets from different years on the same plot ignoring the year

Refer to the answer here: https://www.mathworks.com/matlabcentral/answers/440517-how-to-remove-period-stamp-in-datetime-plot Y...

environ 8 heures ago | 0

Answered

AcitiveX commands in Mac OS?

Yes, it is true, ActiveX is only supported for Windows. That script will not run on macOS. Note this is not MATLAB's limitation,...

AcitiveX commands in Mac OS?

Yes, it is true, ActiveX is only supported for Windows. That script will not run on macOS. Note this is not MATLAB's limitation,...

environ 9 heures ago | 0

| accepted

Answered

Temperature distribution contour plot

You first need to use scatteredInterpolant to convert the data to a grid format and then call contourf(). Since you have very fe...

Temperature distribution contour plot

You first need to use scatteredInterpolant to convert the data to a grid format and then call contourf(). Since you have very fe...

environ 9 heures ago | 0

Answered

Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.

In MATLAB, the input argument in the function definition must be variables. You are writing constant values. Change the function...

Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.

In MATLAB, the input argument in the function definition must be variables. You are writing constant values. Change the function...

environ 9 heures ago | 0

Answered

How to get only real value for equation?

Use nthroot() command y = 0.6447; z = nthroot(y-1, 3)

How to get only real value for equation?

Use nthroot() command y = 0.6447; z = nthroot(y-1, 3)

environ 9 heures ago | 1

| accepted

Answered

how can i create a vector long n arrows and with same string text inside all the arrows

I think you mean 'rows'. Try this M = repmat('31S', 23824, 1)

how can i create a vector long n arrows and with same string text inside all the arrows

I think you mean 'rows'. Try this M = repmat('31S', 23824, 1)

environ 9 heures ago | 0

| accepted

Answered

Selecting pixel of image

This is equation for 2D convolution. Use conv2(): https://www.mathworks.com/help/matlab/ref/conv2.html. For example, I; % your...

Selecting pixel of image

This is equation for 2D convolution. Use conv2(): https://www.mathworks.com/help/matlab/ref/conv2.html. For example, I; % your...

environ 10 heures ago | 0

Answered

Output argument 'x' is not assigned on some execution paths.

Ok. I suspect you are trying to run this code on Simulink in the MATLAB function block. Since you didn't provide this informatio...

Output argument 'x' is not assigned on some execution paths.

Ok. I suspect you are trying to run this code on Simulink in the MATLAB function block. Since you didn't provide this informatio...

environ 11 heures ago | 0

| accepted

Answered

Find the structure name which created the variable

Not possible in MATLAB. A somewhat similar thing can be done by creating a custom handle class and define a parent property, bu...

Find the structure name which created the variable

Not possible in MATLAB. A somewhat similar thing can be done by creating a custom handle class and define a parent property, bu...

environ 11 heures ago | 0

Answered

Subtracting two numbers gives 0 as answer

You are getting zero because the images are probably in uint8 format and negative results are given a value of zero in that case...

Subtracting two numbers gives 0 as answer

You are getting zero because the images are probably in uint8 format and negative results are given a value of zero in that case...

environ 11 heures ago | 0

| accepted

Answered

How to group values to display in bar charts while doing data analysis

See retime(): https://www.mathworks.com/help/matlab/ref/timetable.retime.html Even using splitapply() with findgroups() will b...

How to group values to display in bar charts while doing data analysis

See retime(): https://www.mathworks.com/help/matlab/ref/timetable.retime.html Even using splitapply() with findgroups() will b...

environ 11 heures ago | 1

| accepted

Answered

Probability density function for a time series of pressure data

You can use histogram() with pdf normalization. However, your data points seem to have a different distribution data = readmatr...

Probability density function for a time series of pressure data

You can use histogram() with pdf normalization. However, your data points seem to have a different distribution data = readmatr...

environ 11 heures ago | 0

Answered

Delete some matrix rows that contain zero values in some part

Try this idx = any(A(:,1:8), 2); A = A(idx, :); A = [ 31251 31252 31261 31260 31372 31373 31382 31381 3 3 0 0 0 0 31252 3...

Delete some matrix rows that contain zero values in some part

Try this idx = any(A(:,1:8), 2); A = A(idx, :); A = [ 31251 31252 31261 31260 31372 31373 31382 31381 3 3 0 0 0 0 31252 3...

environ 12 heures ago | 0

Answered

error of min() function in matlab function block in simulink (v 2018b)

According to documentation, the 'all' option is not supported for code-generation in R2018b (i.e., it will not work in Simulink)...

error of min() function in matlab function block in simulink (v 2018b)

According to documentation, the 'all' option is not supported for code-generation in R2018b (i.e., it will not work in Simulink)...

environ 12 heures ago | 1

| accepted

Answered

Is there any way to get numerical result from symbolic function?

If you have a symbolic function, you can directly evaluate by giving the input. For example syms x y(x) = x.^2 + 2*x + 3; % sy...

Is there any way to get numerical result from symbolic function?

If you have a symbolic function, you can directly evaluate by giving the input. For example syms x y(x) = x.^2 + 2*x + 3; % sy...

environ 13 heures ago | 0

| accepted

Answered

3D - Surface Response Plot - Surface of best fit

If you have a curve fitting toolbox, you can use fit(): https://www.mathworks.com/help/curvefit/fit.html function with fitype ch...

3D - Surface Response Plot - Surface of best fit

If you have a curve fitting toolbox, you can use fit(): https://www.mathworks.com/help/curvefit/fit.html function with fitype ch...

environ 13 heures ago | 0

| accepted

Answered

Get pixel where the intensity is 255

img; % 2048x2448 matrix [r, c] = find(img==255); % r and c contain all row and columns If you want to mark these points on the...

Get pixel where the intensity is 255

img; % 2048x2448 matrix [r, c] = find(img==255); % r and c contain all row and columns If you want to mark these points on the...

environ 14 heures ago | 1

| accepted

Answered

How can i find a value?

interp1(): https://www.mathworks.com/help/matlab/ref/interp1.html does exactly this. x; % x-values from excel file y; % y-valu...

How can i find a value?

interp1(): https://www.mathworks.com/help/matlab/ref/interp1.html does exactly this. x; % x-values from excel file y; % y-valu...

environ 15 heures ago | 0

Answered

Will poly2sym command always show the output like this ?

By simplified view do you mean something like this If yes, then add the following line at the end of your code vpa(c,4)

Will poly2sym command always show the output like this ?

By simplified view do you mean something like this If yes, then add the following line at the end of your code vpa(c,4)

environ 15 heures ago | 0

Answered

移動平均値を求めたい

See movmean(): https://www.mathworks.com/help/matlab/ref/movmean.html. For only using past values, write in like this x; % sign...

移動平均値を求めたい

See movmean(): https://www.mathworks.com/help/matlab/ref/movmean.html. For only using past values, write in like this x; % sign...

environ 16 heures ago | 1

Answered

Parametric Solving Equations with Constraints

You can use assume() to tell MATLAB about these constraints. For example syms a b x y d e assume(x>0) assume(y>b) eq1= ...

Parametric Solving Equations with Constraints

You can use assume() to tell MATLAB about these constraints. For example syms a b x y d e assume(x>0) assume(y>b) eq1= ...

environ 16 heures ago | 0

Answered

RTX 3080 recompiling issue in Matlab 2020a

The new GPU series by NVIDIA is powered by Ampere Architecture. MATLAB still does not support this GPU properly. You will notice...

RTX 3080 recompiling issue in Matlab 2020a

The new GPU series by NVIDIA is powered by Ampere Architecture. MATLAB still does not support this GPU properly. You will notice...

environ 16 heures ago | 1

Answered

How can i find results of functions for symbolic points?

You need to assign value of x1, x2, and u seperately. The following code works without error syms t x1 = 1 - (14284088626631...

How can i find results of functions for symbolic points?

You need to assign value of x1, x2, and u seperately. The following code works without error syms t x1 = 1 - (14284088626631...

environ 16 heures ago | 0

| accepted

Answered

How to solve this

Following shows how to find a numerical solution. You ODEs seems stiff, therefore, I used a stiff solver (ode23s). tspan = [0 1...

How to solve this

Following shows how to find a numerical solution. You ODEs seems stiff, therefore, I used a stiff solver (ode23s). tspan = [0 1...

environ 16 heures ago | 0

| accepted