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Teja Muppirala

MathWorks

Active since 2011

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Answered
How to calculate distance between center of white pixels in an image?
You can find the center (centroid) of each white region using REGIONPROPS, and then just calculate the distance between the cent...

5 years ago | 1

Answered
Calculating Angle Between Two Vectors / Three Points
The units on the axes are very different. Displacement is around +/- 3 while shear is around +/- 80, so the calculated angles f...

5 years ago | 1

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Answered
solve and plot a system of nonlinear 2nd order differential equations
If you just need a plot and not a closed-form solution, then I'd recommend just using ODE45 without worrying about symbolic stuf...

5 years ago | 1

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Answered
Figure作成時にNaNとInfだけ黒に指定する方法
NaNやInfを透明にして、背景を黒にすることは一つにアイディアです。 例えば： rng(0); X = peaks(20); % 適当なデータを作成 X(randperm(numel(X),3)) = nan; % 適当にNaNを入れる X(r...

6 years ago | 5

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Answered
Up-sampling in convolutional neural network
I think you may be able to do it using a transposedConv2dLayer. This works, (though I'm not entirely confident that this is the ...

6 years ago | 0

Answered
how to overlay(superimpose) contour plot(coloured) over a gray scale image
A grayscale image with a colored contour plot superimposed: % Make some sample grayscale image I = abs(sin((1:500)'/100)*sin((...

6 years ago | 1

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Answered
Simultaneously numerically integrate coupled ODE's in MATLAB
You can get dx2/dt by multiplying dx2/dx1 * dx1/dt. As a simple example say (I'll use x and y instead of x1 and x2 cause it's...

7 years ago | 0

Answered
I need to overlay a color map over a gray scale image with with the colorbar on the side.
Something like this maybe? figure; ax1 = axes; imagesc(x); colormap(ax1,'gray'); ax2 = axes; imagesc(ax2,T...

7 years ago | 5

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Answered
How can I plot the graph of a gyroid which is composed of 3 variables in the form of F(x,y,z)=t
fimplicit3(@(x,y,z) sin(x).*cos(y)+sin(y).*cos(z)+sin(z).*cos(x)) Note that for element-wise multiplication I made sure to ...

7 years ago | 1

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Answered
数値積分を行う上でIntegralの扱い方
割り算のところで　/ を使っていますが、それに点をつけて 　./ 　にする必要があります。 ntf = @(x) abs(((1i*2*pi*x).^3)./((1i*2*pi*x).^3+k1*(1i*2*pi*x).^2+k2*(1i*2*p...

7 years ago | 1

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Answered
Simulink上で計算した値をMatlabの.ｍファイルの計算部分に組み込む方法はありますか？
まず出力したい信号にOutportをつなげて、 <https://www.mathworks.com/help/simulink/slref/outport.html> "sim" コマンドでモデルを実行し、出力の値を取得したらどうでしょうか。...

7 years ago | 4

Answered
Vectorization, check if points coordinate is exist in an image or no
signVector = ones(size(coordinates,1),1); inds = sub2ind(size(N),coordinates(:,1),coordinates(:,2)); % Convert to linear in...

7 years ago | 0

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Answered
How to find volume under fitted data?
If you have a function y = f(r), which it sounds like you do since you have a polynomial, then you can use integral. y = ...

7 years ago | 0

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Answered
InterX issues. Showing intersection when there is none.
The intersections are actually there. The issue is just in plotting. Straight lines between two points aren't straight on a s...

7 years ago | 1

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Answered
How do I solve a second order non linear differential equation using matlab.
syms z(t) t A B zp = diff(z,t); zpp = diff(z,t,2); eqn = ( zpp + A*zp^2 == B ); cond = [z(0)==0, zp(0)==0...

7 years ago | 2

Answered
Moving a curve in one axis to ascertain area under the curve is zero
Calculate the value of the integral when d_opt = 0, and then use that to set d_opt to cancel the integral out. b = 0.1; ...

7 years ago | 1

Answered
How to input transfer function without simplifying it?
s = tf('s') G = (s+2)/(s*(s-1)*(s+6)^2) This gives a transfer function (tf) with the polynomials expanded G = ...

7 years ago | 5

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Answered
Matlab's quad equals 0 when over 0 to 6 and actual value over 3 to 5
First, QUAD is very outdated, <https://www.mathworks.com/help/matlab/ref/integral.html INTEGRAL> (introduced in R2012a) is recom...

7 years ago | 1

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Answered
How to ensure text on plot always in front?
One workaround would be to create an invisible axes on top, and then put the text in there. figure ax1 = axes; mesh(a...

7 years ago | 2

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Answered
複数入力があるときのモデル同定（System Identification toolbox）
はい、多入力多出力モデルの同定も可能です。 例えば： <https://jp.mathworks.com/help/ident/examples/dealing-with-multi-variable-systems-identification-...

7 years ago | 3

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Answered
looking for something similar for maximum filter calculation
Yes, in MATLAB the function is <https://www.mathworks.com/help/images/ref/imdilate.html IMDILATE>. The "NHOOD" argument is an...

7 years ago | 1

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Answered
Applying equation to each field in a structure
For 4 variables, copy/pasting seems doable, but if you had a lot more I can see how it could be cumbersome. This is a soluti...

7 years ago | 0

Answered
Would be possible to calculate half hour average by using retime?
Yes, there is an example a little bit down the in the documentation for <https://www.mathworks.com/help/matlab/ref/retime.html R...

7 years ago | 1

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Answered
How to save an axes within a GUI to a .fig
This might work. You create a new (temporary and invisible) figure, and then use COPYOBJ to copy that axes to the new figure. Y...

7 years ago | 4

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Answered
Is there any way I can make the attached contour plots more smooth ?
Maybe a median filter? However ORDFILT2 needs the Image Processing Toolbox. Z = peaks(501); % Sample data Z = Z +0.1*ran...

7 years ago | 0

Answered
Why is getting Uniform Random Numbers so difficult!?!?
Try putting the seed value to: randi(intmax)

7 years ago | 0

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Answered
Double integral with one integral having limits as a function of other variable
You can put functions inside of functions %% Embed A into fun_Z0, and tell INTEGRAL to only accept scalar inputs l1=3e...

7 years ago | 0

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Answered
Where is the issue in my "while" statement?
You were on the right track. This gives 2520: n=1; while any( mod(n,1:10)~=0 ) n=n+1; end n Whe...

7 years ago | 0

Answered
Numerical Integration with Parameters
For example, if the function is f(x) = 1+s*x+b*x^2 and you're integrating from 0 to 1, and you want to find the b (numerically) ...

8 years ago | 0

Answered
System of differential equations with constant (as variables) coefficients
As has been mentioned, with the k's explicitly accounted for, it's very complicated. But if you consider the matrix X simply ...

8 years ago | 2

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