Answered
beginner question :subject : For loops , while loops , index variable
This is what I would do: for k=1:length(t) if t(k)<=0 y4(k)=3*t(k)^2 + 5; else y4(k)=-3*t(k)^2 + 5; ...

11 years ago | 0

Answered
Using the 'diff' function inside the 'find' function.
Her is my guess. Why don´t you just store k in a vector? I mean something like aux= zeros(length(d2x)); aux2=1; for k...

11 years ago | 0

Answered
How fill a part of 3D array with decreasing values?
I think you are trying to do something like this >> a=20:-2:2; >> for i=1:10 for j=1:10 X(i,j,1:10)=a(1:10); en...

11 years ago | 0

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Answered
How I can know elements of a matrix
If you want to find if you have a 1000 in your matrix try the same thing, but change 1 for 1000 find(I==1000) Will retu...

11 years ago | 0

Answered
How I can know elements of a matrix
When you multiply the matrix by 1000 you have binary values(1 and 0 true false)no more.So I don´t know what you exactly mean by ...

11 years ago | 0

Answered
How can I open excel file in Mathlab
Use the xlsread function to read the excel values and store them in a vector, so that you can represent them using the plot comm...

11 years ago | 0

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can anyone help me in finding out the location of zero crossing point of an signal whose peak is determined
Hi,if you have a signal like this c = Columns 1 through 15 0 1 2 3 4 5 6 7...

11 years ago | 0

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how to analyze frequency response ?
Hi Gokul, freqz is used to find the frecuency response, once you have designed your b and a vectors. [h,w]=freqz(b,a,n) ...

11 years ago | 0

Answered
NEED ANSWERS IN NUMERICAL FORM
Try this: >> a= input('Enter First Strain Gauge readings'); b= input('Enter Second Strain Gauge readings'); c= input(...

11 years ago | 1

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what is wrong when using fzero
You can use solve instead of fzero

11 years ago | 0

Question


Is there a way to free RAM consumed by Matlab without closing Matlab?
Hi,I am working with a program which is consuming a huge amount of RAM memory, and I would like to know if it is possible to fre...

11 years ago | 5 answers | 1

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answers

Answered
How to pass a audio signal through a filter
This is fine at the moment. Now filter with from 0 to 4000Hz to make sure the results are different(I mean if you filter from 40...

11 years ago | 0

Answered
How to pass a audio signal through a filter
The first step is to design a filter to obtain the A and B vector coefficients.Then use the Butter function, for instance to obt...

11 years ago | 1

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Answered
How to find the value of R ?
Is this what you mean? >> A=27; >> E=1:1:10; >> R = 0.173*(E.^3/2)*A.^1/3 R = Columns 1 through 9 ...

11 years ago | 0

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Answered
Solving a complicated equation in matlab
I think there is nothing wrong with your code. If I do f(-0.351409329825233) the answer is ans = -3.9968e-...

11 years ago | 1

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Answered
Finding jacobian of a matrix
The jacobian command calculates symbollically the jacobian of a given matrix. The following example can be found in the Mathw...

11 years ago | 0

Answered
problems about solve exponential function
When you execute this code in Matlab >> syms x; >> f=-10*exp(-x); >> solve(f,x) >> isempty(a) ans = ...

11 years ago | 0

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Answered
problems about solve exponential function
In the warning message displayed by Matlab it says no solution has been found(just as it happens if the function has no roots), ...

11 years ago | 0

Question


cannot figure out the reason for a warning message
Hi, I am working with a piece of code, and though the code seems to work well(as the results yielded seem to be correct)Matlab s...

11 years ago | 0 answers | 0

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Answered
Find vector elements that sum up to specific number
I don´t know any specific Matlab command to adress your problem, however you can write an M-file to solve your problem. A po...

11 years ago | 0

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Suggest a data structure to represent a set of geographical points
Try using multidimensional arrays. The idea is that the "third dimension" represents the index of your bidimensional latitude-lo...

11 years ago | 0

Answered
problem with imag command when evaluating symbolic expressions.
The answer is right, if you try subs((9*i*conj(x))/2 - (i*y)/2 - (9*i*x)/2 + (i*conj(y))/2 + 4),{x,y},{0,0}) or subs((9*i*conj(x...

11 years ago | 0

Question


problem with imag command when evaluating symbolic expressions.
Hi, when I execute the following code in Matlab syms x y; f=4*i+9*x+y; imag(f) I get the following result ans = ...

11 years ago | 2 answers | 0

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Answered
Discrete acceleration data to position
I am not sure, but theoretically ,if you have acceleration, and you want to get displacement, you have to integrate to get veloc...

11 years ago | 0

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Answered
What will be the sampling frequency of the following time series data??
I am not sure I am understanding your question very well, but it seems you have a sample every 0.00274 units of time. You have t...

11 years ago | 0

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Question


How can I solve a problem with subs?
I have to substitute values in a matrix with 20 variables. I substitute variable after variable using a for loop, but in some ca...

11 years ago | 1 answer | 0

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