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# Abin Krishnan

Active since 2013

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Question

Finding the maximum amplitude in a spectrogram for a range of frequencies
I have plotted the spectrogram of a pressure signal. The maximum amplitude occurs between 1500 and 2000 Hz. How to find the maxi...

8 years ago | 1 answer | 0

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How to find the decay rate of a decaying signal ?
I have a sinusoidal sognal which decays exponentially in time. I would like to find the decay rate of the signal.

8 years ago | 1 answer | 0

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how to plot fft of signal with time axis ?
I have a pressure signal of length 5 seconds. I want to plot an FFT of the signal with one axis showing the amplitude, the secon...

8 years ago | 1 answer | 0

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Why is the output of 'movie2avi' not showing the movie properly?
I'm trying to save a movie as .avi file using the command movie2avi. The code is as follows: b=0.3; h=0.5; m=2; ...

8 years ago | 1 answer | 0

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Inputing a matrix ito a differential equation
I have to solve a differential equation which is like (d/dt)X=Y where X and Y are vectors. X is like x1,x2,x3,..,x10 and Y is li...

10 years ago | 0 answers | 0

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How to solve a differential equation for a range of parameter values?
i have a differential equation which contains x as the independent variable and y as the dependent variable.It also contains a p...

10 years ago | 0 answers | 0

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How to solve wave equation numerically?
I have to solve the 1 dimensional wave eqation numerically with a axial temperature gradient..

10 years ago | 0 answers | 0

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How to find correlation between two images.?
I have a pair of images which shows tiny particles as dots. I have to take a small portion of the first image and correlate with...

10 years ago | 1 answer | 0

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How to solve complex equations in matlab.?
I have an equation Y=-(1-R)/(1+R); where both Y and R are imaginary. Given the real and imaginary parts of Y (e.g - (0.6,0) ),...

10 years ago | 2 answers | 0

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Question

How to accesss the columns of a matrix in a cell array in matlab?
I have a cell 8X1.The elements are matrices of m-by n dimensions. I want to take the count of the elements in the nth row..

10 years ago | 1 answer | 0

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how to obtain the last index of a column vector containg a set of given values?
I have a column vector which shows time. I'm trying to find out the index using the find command. My input command was. >> s=fi...

10 years ago | 1 answer | 0

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Grouping a given matrix into sub matrices
I have a matrix (1000 X 2) of two columns: first column is the time and the second column is the velocity at the respective time...

10 years ago | 2 answers | 0

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Question

How to divide the data of a matrix?
I have a data in which the first column gives the time and the second column gives the velocity. The time varies from 0 to 0.8 s...

10 years ago | 1 answer | 0

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Question

Combining plots of different scale
I have to combine two plots of different scale.is it possible to have the second y axis on the right hand side for the graph?

10 years ago | 1 answer | 0

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How to sort two columns of a data
I have an excel sheet with two columns:one showing the diameter of the drops and the other the corresponding velocity.I have to ...

10 years ago | 1 answer | 0

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Unable to solve simultaneous equations!
I tried solving the simultaneous equations in Matlab by writing the following commands: >> syms a b >> [a,b]=solve(a+b==...

10 years ago | 1 answer | 0

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How to select the same point in a second image which has moved a distance compared to first image?
I manually extracted the coordinates of a point from an image using the ginput command. the point has moved a distance in the s...

10 years ago | 0 answers | 0

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how to find solutions to simultaneous equtions
i have three equations with three unknowns. I need to find the unknowns.

10 years ago | 0 answers | 0

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Question

How to find the coordinates of to points in a image?
I have two points in a image. I want to fix coordinates of the two points and convert them into polar coordinates. My intention ...

10 years ago | 1 answer | 0

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Question

Howto find out the distance travelled by a point on a rotating ceiling fan?
I'm trying to find the rpm of the ceiling fan using MATLAB. The idea is to mark a point and take images of the rotating fan.

10 years ago | 2 answers | 0

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