Answered

hi,i am getting error as not enough input arguments,while i run the below code....?? please let me know that?(the error is in second line of code)

Works fine for me, if called with *_2_* input arguments: res = trio(3,4) function x=trio(m,n) x=rand([3*m n]); ...

hi,i am getting error as not enough input arguments,while i run the below code....?? please let me know that?(the error is in second line of code)

Works fine for me, if called with *_2_* input arguments: res = trio(3,4) function x=trio(m,n) x=rand([3*m n]); ...

4 månader ago | 0

Answered

How to solve coupled (differential) equations of motion using matlab?

Whta is the problem? There is an analytical solution (here assumed that vx0 and vz0 are equal to 1): syms w b g m x(t) y(t) z(t...

How to solve coupled (differential) equations of motion using matlab?

Whta is the problem? There is an analytical solution (here assumed that vx0 and vz0 are equal to 1): syms w b g m x(t) y(t) z(t...

4 månader ago | 0

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Answered

Undefined operator '/' for input arguments of type 'function_handle'

b=400; %mm d=500; %mm Asv = [3000 5000 3000 5000]; %mm^2 fckv = [30 30 90 90]; %Mpa num_fckv = numel(fckv); fsolve_opt...

Undefined operator '/' for input arguments of type 'function_handle'

b=400; %mm d=500; %mm Asv = [3000 5000 3000 5000]; %mm^2 fckv = [30 30 90 90]; %Mpa num_fckv = numel(fckv); fsolve_opt...

4 månader ago | 0

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Answered

Can't plot function

x = linspace(0,10); y = sqrt(1+x.^2)./sqrt(x.^4-x.^2+1); plot(x,y)

Can't plot function

x = linspace(0,10); y = sqrt(1+x.^2)./sqrt(x.^4-x.^2+1); plot(x,y)

4 månader ago | 1

| accepted

Answered

Fit Powerlaw to Data

https://de.mathworks.com/help/curvefit/custom-nonlinear-models.html

Fit Powerlaw to Data

https://de.mathworks.com/help/curvefit/custom-nonlinear-models.html

4 månader ago | 0

Answered

Numerical Solution for a System of Three ODEs with Different Constant for Each Time Element

Use interp1 for this. Here is an example: https://de.mathworks.com/matlabcentral/answers/487412-using-ode45-to-solve-differenti...

Numerical Solution for a System of Three ODEs with Different Constant for Each Time Element

Use interp1 for this. Here is an example: https://de.mathworks.com/matlabcentral/answers/487412-using-ode45-to-solve-differenti...

4 månader ago | 0

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Answered

Text file manipulation, find specific lines, find there a string and replace the specific line with new content

There is a bunch of possibilities to manipulate strings: https://de.mathworks.com/help/matlab/ref/extractafter.html https://de...

Text file manipulation, find specific lines, find there a string and replace the specific line with new content

There is a bunch of possibilities to manipulate strings: https://de.mathworks.com/help/matlab/ref/extractafter.html https://de...

4 månader ago | 0

Answered

Fitting an equation to a Sine Function with NonLinearModel.fit

"...I already tried using the "cftool" function in matlab but it did not have the equation I need...." Did you notice that yo...

Fitting an equation to a Sine Function with NonLinearModel.fit

"...I already tried using the "cftool" function in matlab but it did not have the equation I need...." Did you notice that yo...

4 månader ago | 0

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Answered

How to replace last 3 digits in a floating point number by another 3 digits

format long x = -3.141592653589793; a = 287; x_new = sprintf('%.15f',x); x_new(end-2:end) = (sprintf('%d',a)); x_new = st...

How to replace last 3 digits in a floating point number by another 3 digits

format long x = -3.141592653589793; a = 287; x_new = sprintf('%.15f',x); x_new(end-2:end) = (sprintf('%d',a)); x_new = st...

4 månader ago | 0

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Answered

I am trying to use ODE45, but I keep getting an error with myfcn saying I don't have enough inputs?

There are at least 4 problems in your code: 1. Split your main code and your ode function: tspan = [0 10]; f0 = [0 0]; ...

I am trying to use ODE45, but I keep getting an error with myfcn saying I don't have enough inputs?

There are at least 4 problems in your code: 1. Split your main code and your ode function: tspan = [0 10]; f0 = [0 0]; ...

4 månader ago | 1

Answered

Having trouble with ODE45 and a System of Ordinary Differential Equations

For every equation you have to input an initial condition. You have 8 but only give 2 initial conditions to ode45. Also your ...

Having trouble with ODE45 and a System of Ordinary Differential Equations

For every equation you have to input an initial condition. You have 8 but only give 2 initial conditions to ode45. Also your ...

4 månader ago | 0

Answered

Is there a function to turn ?x2 matrix of coordinates of vertices of a polygon into a ?x4 matrix of coordinates of line segments of that polygon?

Yes, circshift will do the job: A = [2, 4; 5, 6; 6, 6; 8,5] B = [2, 4, 5, 6; 5, 6, 6, 6; 6, 6, 8, 5; 8, 5, 2, 4] % The sol...

Is there a function to turn ?x2 matrix of coordinates of vertices of a polygon into a ?x4 matrix of coordinates of line segments of that polygon?

Yes, circshift will do the job: A = [2, 4; 5, 6; 6, 6; 8,5] B = [2, 4, 5, 6; 5, 6, 6, 6; 6, 6, 8, 5; 8, 5, 2, 4] % The sol...

4 månader ago | 0

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Answered

could anyone help me to display the values in the matrix which are greater than the average value for the following code

B, C and D are not needed, if you use the inbuilt function mean: A=[3.3734 5.1245 4.3729 2.8406 6.5283 4.8144 ...

could anyone help me to display the values in the matrix which are greater than the average value for the following code

B, C and D are not needed, if you use the inbuilt function mean: A=[3.3734 5.1245 4.3729 2.8406 6.5283 4.8144 ...

4 månader ago | 0

| accepted

Answered

How can calcuate the lines of code efficiently?

Yes, you can if you avoid using a loop and vectorize your code - see here: tic %%%code nx=512; ny=nx; dx=1; dy=dx; format...

How can calcuate the lines of code efficiently?

Yes, you can if you avoid using a loop and vectorize your code - see here: tic %%%code nx=512; ny=nx; dx=1; dy=dx; format...

4 månader ago | 1

| accepted

Answered

how can i differentiate a constant in simulink?

You already have done everything exactly correct - Simulink also did what is correct. What is the derivative of y(t)=3 with resp...

how can i differentiate a constant in simulink?

You already have done everything exactly correct - Simulink also did what is correct. What is the derivative of y(t)=3 with resp...

4 månader ago | 0

| accepted

Answered

Eigenvalues and Eigenvectors of Symbolic Matrix

syms E t H = [E -t -t -t -t 0 0 0 0;-t E 0 0 0 -t -t 0 0;-t 0 E 0 0 0 0 -t -t;... -t 0 0 E 0 -t 0 -t 0; -t 0 0 0 E 0 -t 0...

Eigenvalues and Eigenvectors of Symbolic Matrix

syms E t H = [E -t -t -t -t 0 0 0 0;-t E 0 0 0 -t -t 0 0;-t 0 E 0 0 0 0 -t -t;... -t 0 0 E 0 -t 0 -t 0; -t 0 0 0 E 0 -t 0...

4 månader ago | 0

| accepted

Answered

what is wrong with my script

clear all for loop_index = 1:2 x = input('Input number to convert'); units = input('Input the units to convert from','s...

what is wrong with my script

clear all for loop_index = 1:2 x = input('Input number to convert'); units = input('Input the units to convert from','s...

4 månader ago | 1

| accepted

Answered

Any trick to name a variable with decimal number?

No, it is simply not allowed in Matlab. No way, no trick: https://de.mathworks.com/help/matlab/matlab_prog/variable-names.html#...

Any trick to name a variable with decimal number?

No, it is simply not allowed in Matlab. No way, no trick: https://de.mathworks.com/help/matlab/matlab_prog/variable-names.html#...

4 månader ago | 0

Answered

PULL OUT A SPECIFIC WORD FROM A LONG STRING

You might want to start reading here: https://de.mathworks.com/help/matlab/matlab_prog/searching-and-replacing.html

PULL OUT A SPECIFIC WORD FROM A LONG STRING

You might want to start reading here: https://de.mathworks.com/help/matlab/matlab_prog/searching-and-replacing.html

4 månader ago | 1

| accepted

Answered

How do I create a for loop to extract data from table?

No loop is needed: A = unstack(ReactionTime,'RESPONSE_TIME_ehmi','videostring') since you have invalid names for you video fil...

How do I create a for loop to extract data from table?

No loop is needed: A = unstack(ReactionTime,'RESPONSE_TIME_ehmi','videostring') since you have invalid names for you video fil...

4 månader ago | 0

| accepted

Answered

complement of an image

I = fliplr(imread('cameraman.tif')); I1 = triu((I),1); I2 = tril(imcomplement(I)); I_res = fliplr(I1+I2); imshow(I_res) B...

complement of an image

I = fliplr(imread('cameraman.tif')); I1 = triu((I),1); I2 = tril(imcomplement(I)); I_res = fliplr(I1+I2); imshow(I_res) B...

4 månader ago | 1

| accepted

Answered

Trapz gives "Second and third argument must either be variables or a variable and a nonnegative integer specifying the number of differentiations."

syms x f_scalar = @(x) 5*x^2+3*x-4; g_scalar = @(x) -4*x^2+6*x+5; f = @(vec) arrayfun(f_scalar,vec); g = @(vec) arrayfun(g_sca...

Trapz gives "Second and third argument must either be variables or a variable and a nonnegative integer specifying the number of differentiations."

syms x f_scalar = @(x) 5*x^2+3*x-4; g_scalar = @(x) -4*x^2+6*x+5; f = @(vec) arrayfun(f_scalar,vec); g = @(vec) arrayfun(g_sca...

4 månader ago | 0

| accepted

Answered

Problem with input of ode113

I_1= pi^2; I_2= -2*pi^2; params.tau= 10; g= 0; V_1= -65; V_2= -65; state= [V_1;V_2]; I= [I_1;I_2]; options = odeset('ab...

Problem with input of ode113

I_1= pi^2; I_2= -2*pi^2; params.tau= 10; g= 0; V_1= -65; V_2= -65; state= [V_1;V_2]; I= [I_1;I_2]; options = odeset('ab...

4 månader ago | 0

| accepted

Answered

How to define discrete variables in GA (genetic algorithm)

https://de.mathworks.com/matlabcentral/answers/401059-setup-discrete-values-for-decision-variables-in-optimization-problems

How to define discrete variables in GA (genetic algorithm)

https://de.mathworks.com/matlabcentral/answers/401059-setup-discrete-values-for-decision-variables-in-optimization-problems

4 månader ago | 0

Answered

Surrogate search with integer parameters

|*intcon*| was introduced to surrogateopt in R2019b. <https://de.mathworks.com/help/gads/release-notes.html>

Surrogate search with integer parameters

|*intcon*| was introduced to surrogateopt in R2019b. <https://de.mathworks.com/help/gads/release-notes.html>

4 månader ago | 0

| accepted

Answered

Accessing value in a cell

Edited because of the comments: a = {'1,65,4,5'} b = str2num(a{:}) b(2)

Accessing value in a cell

Edited because of the comments: a = {'1,65,4,5'} b = str2num(a{:}) b(2)

4 månader ago | 1

| accepted

Answered

Passing parameters in boundary value problem using BVP4C

See here: <https://de.mathworks.com/help/optim/ug/passing-extra-parameters.html |*passing extra parameters*|>. I suggest to eith...

Passing parameters in boundary value problem using BVP4C

See here: <https://de.mathworks.com/help/optim/ug/passing-extra-parameters.html |*passing extra parameters*|>. I suggest to eith...

4 månader ago | 0

Answered

How to extract frames from a .mp4 video?

outputFolder1=('video'); v1=VideoReader('Clock.mp4'); vid1Frames=read(v1); for frame=1:size(vid1Frames,4) outputBaseFileNa...

How to extract frames from a .mp4 video?

outputFolder1=('video'); v1=VideoReader('Clock.mp4'); vid1Frames=read(v1); for frame=1:size(vid1Frames,4) outputBaseFileNa...

4 månader ago | 0

Answered

Plot pixels from 2D boolean array

% your array A = randi(2,101)-1; % the result; R=255*ones(101); G=255*(-A+1); B=255*(-A+1); res = cat(3,R,G,B); ...

Plot pixels from 2D boolean array

% your array A = randi(2,101)-1; % the result; R=255*ones(101); G=255*(-A+1); B=255*(-A+1); res = cat(3,R,G,B); ...

4 månader ago | 0

| accepted

Answered

Return a value from a table

Quarter = {'Q12019'; 'Q22019'; 'Q32019'; 'Q42019'; 'Q12020'; 'Q22020'; 'Q32020'; 'Q42020'}; QuarterStartDate = ['2019-01-01'; '...

Return a value from a table

Quarter = {'Q12019'; 'Q22019'; 'Q32019'; 'Q42019'; 'Q12020'; 'Q22020'; 'Q32020'; 'Q42020'}; QuarterStartDate = ['2019-01-01'; '...

4 månader ago | 1

| accepted