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how to interpolate x and y coordinates of contour?
You extract the contours wrong, at least if you have multiple contours at the same level v(i). It is simpler if you plot all the...

7년 초과 전 | 0

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How to superimpose images, making one of them transparent
Perhaps something like this: B = imread('peppers.png'); % Just to get a sample image subplot(2,2,1) imagesc(B) [i1,j2] = gin...

7년 초과 전 | 0

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exponential function phase reversal
Try: phi = linspace(-5*pi,5*pi,5*360+1); Phi = angle(exp(1i*phi)); plot(phi,Phi) grid on set(gca,'XTick',[-2.5*360:180:2.5*...

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Vectorizing nested for loops
You find a nice contribution from J Kirk on the file exchange: Distmat In my historic appreciation efforts there is this Acklam...

7년 초과 전 | 1

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Parse Error in funtion
Simples, k++ is not valid matlab syntax, sadly according to some, but fact. You'll have to do an excplicit incrementations: ...

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imwarp large image running out of memory
Maybe you can get weasle your way around the problem by divide-and-conquer? Would it work if you applied your warping on a sub-s...

7년 초과 전 | 0

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Plot a Contour with no zigzag
If you have access to the spap2 you could try that function, I'd take a stab at converting your contour-data from Cartesian [X,Y...

7년 초과 전 | 0

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How to perform a truncated SVD
That was an uggly uggly G-matrix. When solving inverse problems the truncation-point is not to be selected close to "at double-p...

7년 초과 전 | 2

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need help about coherence filter
Have a look at the excellent nonlinear-diffusion-toolbox. It contains functions for coherence-enhancing non-linear diffusion fil...

7년 초과 전 | 0

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Multiple EEG-files to one spectrogram
If there is time-gaps in your data-sequence, just do the individual spectrograms as per usual, I'd use something like this: dat...

7년 초과 전 | 1

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Figures with large amounts of data don't export properly to .eps
The solution to avoid this arbitrary choise of output renderer is to explicitly select painters: print('-depsc2','-painters',fi...

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Saving all the variables from an ode45 Function
It seems your w is a scalar, and you've defined Yi11 and Yi12 as global constants (warnings should come but I'll assume you have...

7년 초과 전 | 0

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How do I name the trendline in the legend? Also, how can I get the trend line equation on the plot?
Maybe: if c(2) > 0 equation_string = sprintf('%4.3f x + %4.3f',c(1),c(2)); elseif c(2) < 0 equation_string = sprintf('%4...

7년 초과 전 | 0

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Fitting Lennard-Jones to Morse
First you need to make these potentials comparable - now your LJ12-6 has the dissociation-energy as the zero-level, while your M...

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How do I ensure that the animation remain within the axis limit?
Well you could achieve that by doing something like: plot(p(1,:),p(2,:),'k.','LineWidth',3,'Markersize',15); axPcurr = axis; ...

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Plotting coastlines at different levels in a 3D plot
Since you've selected to set zdir to 'reverse' your coastline-plot might look better something like this: z_bottom = max(get(gc...

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How to view the Frequency content of an image
Try something like: ftI = fft2(I); imagesc(log10(abs(ftI))) caxis([-6 0]+max(caxis)) Then you have the DC-component in the u...

7년 초과 전 | 0

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How can I call the variables of MATLAB workspace from a function?
I suppose you can build something with the matlab-function evalin, Something like: savename = 'whatever.mat'; savecmd = ['save...

7년 초과 전 | 1

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legendre function of second kind
You can find a toolbox for special functions on the file exchange: Computation of Special Functions I haven't (or at least don...

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How do I save every nth Frame of a video and save these images to a folder of my choosing
If you follow the steps from the help on VideoReader, it should be perfectly possible to replace the frame-by-frame reading des...

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find index values in a 3D matrix above a threshold
To find indices to values larger than 1 do: [i1,i2,i3] = find(A>threshold); After that you might have to loop over the indices...

7년 초과 전 | 0

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Using ginput with imshow: how to save pixel instead of axis coordinates
Not directly from ginput. You can easily do whatever rounding of the coordinates you've chosen directly after: [x,y] = ginput(2...

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Adding noise to hyperspectral image (.mat file)
Gaussian blur is just a convolution of your image with a 2-D Gaussian PSF for normal images (for an RGB image it might be slight...

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How to plot vector time series
Sure you can try speed and wind direction as time-series: subplot(2,1,1) plot(t,atan2(u,v)) subplot(2,1,2) plot(t,(u.^2+v.^2...

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Acoustic modes in a room, standing wave pattern with nodes and anti-nodes.
Use meshgrid to build 3-D arrays for x y and z: X = 0:0.1:lx; Y = 0:0.1:ly; Z = 0:0.1:lz; [X,Y,Z] = mehsgrid(X,Y,Z); P = A*...

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Please help me make this function periodic
Write a function for that pulse shape, then have a look at the pulstran function. HTH

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how to get the inverse of a symmetric matrix and ensure accurancy
If you want an inverse that is nice in that sense you could always simply do an eigenvalue decomposition of F. Then the eigenval...

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Scanning the Object in Parts and Image Reconstruction
To avoid the having non-illuminated black spots you cant move the light-source the full diameter in the horizontal direction, ti...

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How to judge polyfit output is correct or not?
Today my crystal ball is very clear (head not) so I see a good answer to this age old question. Since you have a very large n...

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Saving .mat file with different names
You can use the functional form of save: X = data_of_interest1; Y = data_of_interest2; % and save_name = sprintf('NH_%03d_%0...

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