Yuji Zhang
Tufts University Medford
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I'm a Ph.D. student working on nonlinear optics. I use Matlab to process experimental data and, the more complicated thing is, perform numerical simulation of light propagation based on partial differential equations.
Professional Interests: nonlinear optics
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Awarded to Yuji Zhang on 09 Oct 2019
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Awarded to Yuji Zhang on 20 Jul 2017
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Question
display rescaled matrix as image: imagesc vs wcodemat
Hi I tried two ways to rescale a matrix and display as an image: imagesc and wcodemat. Worded well in Fig 1. But in figure 2:...
presque 10 ans il y a | 1 réponse | 0
0
réponsenumber divided by vector
I think I figured out myself. Division is defined by multiplication. For any A, B, and C, A/B = C means A = B*C. Note ...
plus de 10 ans il y a | 0
Question
number divided by vector
Hi everyone~ I divided a number by a vector and forgot to use ./ Why it didn't report error and gave me some result? What's the...
plus de 10 ans il y a | 4 réponses | 0
4
réponsesQuestion
is x' * x faster than x.^2 (x is a vector)
Hi~ Somebody recommended me to use x' * x. Is it faster than sum(x.^2) ? Any thoughts are appreciated. Thanks! [EDITED, s...
plus de 10 ans il y a | 2 réponses | 1
2
réponsesQuestion
access values in dataset
hi In the results of lm = LinearModel.fit(x, y) there is lm.Coefficients containing the coefficient values. E.g., >...
plus de 10 ans il y a | 2 réponses | 0
2
réponsesQuestion
what does c(:).' mean? c should be a vector
Hi I saw this in Matlab document: function obj = DocPolynom(c) % Construct a DocPolynom object using the coefficients...
plus de 10 ans il y a | 2 réponses | 0
2
réponsesQuestion
waterfall appear to be out of box
Hi everyone, One waterfall plot appears that the curve are for outside the axis range. See this... Does anyone know how to fi...
presque 11 ans il y a | 1 réponse | 0
0
réponseQuestion
how to see the script of build-in function?
Hi all~ I put "edit sum" in the command line. And I only saw the notes about it (begin with %). How can I see the script of t...
presque 11 ans il y a | 1 réponse | 0
1
réponseQuestion
reverse of fnval: evaluate the variable for given value of function
Hi everyone~ See the picture. The blue dots are my data. I want to find out at what x values the function drop to -20 (red ci...
environ 11 ans il y a | 1 réponse | 0
1
réponseQuestion
curve fitting: how to get the fitting curve?
Hi everyone~ I did some curve fitting using curve fitting toolbox. But I don't know how to get the fitting curve. Can somebo...
environ 11 ans il y a | 1 réponse | 0
1
réponseQuestion
about axis ticks: how to set 10 ticks with 5 labels?
Hi everyone, I want the axis to have ticks at 1:1:10, and tick labels only at 2:2:10 Anybody know how to do this? I tri...
environ 11 ans il y a | 1 réponse | 0
1
réponseQuestion
figures got chopped when saved using "print"
Hi everyone~ I plot some figures, and save them to .tif file using "print" But it often got chopped. I use the code ...
plus de 11 ans il y a | 1 réponse | 0
0
réponseQuestion
multiple fittings in comparison in curve fitting toolbox
Hi everyone~ I'm using the curve fitting toolbox, for curve fitting, of course. I couldn't figure out how to show multiple...
plus de 11 ans il y a | 1 réponse | 0
0
réponseQuestion
-v7.3 switch
Hi everyone~ I had problem saving a large variable (It's a cell. I think the problem is it's very large) The message is th...
plus de 11 ans il y a | 1 réponse | 1
1
réponseQuestion
loss of details using "print"
Hi everyone~ I was trying to plot some nice graphs. I tuned everything. It shows what I want in the Matlab plot window. But w...
plus de 11 ans il y a | 1 réponse | 0
1
réponseQuestion
pcolor - how to smooth
Hi everyone~ I'm plotting some contour map (x, y, z) If I use Origin, it does some nice smoothing. In Maltab, using ...
plus de 11 ans il y a | 3 réponses | 0
3
réponsesQuestion
why definition of sine transform is not consistent with FFT?
<<https://lh4.googleusercontent.com/-QiXTlOnPnxE/UhRwYWPguoI/AAAAAAAAAx0/h2iASWeaI18/w1027-h432-no/dst.jpg>> See the picture....
plus de 11 ans il y a | 1 réponse | 0
0
réponseQuestion
the size of plot using "print"
Hi everyone~ I have a question about saving plot as pictures. I heard of the Oliver Woodford code but still want to check wi...
plus de 11 ans il y a | 1 réponse | 0
0
réponseQuestion
genvarname -> Index exceeds matrix dimensions.
Hi everyone~ I have a quite stupid question here. genvarname doesn't work here, like this: >> vname = genvarname ('aaa'...
plus de 11 ans il y a | 1 réponse | 0
1
réponseQuestion
manually run ode45 step by step - and impose filter to the half-way solution
Hi everybody~ I'm solving a ode: %% code 1 t = [tt1 tt2 tt3 ... tt100]; [t, y] = ode45(@equation, t, y1, optio...
plus de 11 ans il y a | 1 réponse | 0
1
réponseQuestion
how to create customized curve ( only know the shape )
<<https://lh5.googleusercontent.com/-carEAOQXYm4/UcA2uOb251I/AAAAAAAAArQ/gBZKnJAQ8_o/w356-h463-no/curve.jpg>> Hi everyone~ ...
plus de 11 ans il y a | 3 réponses | 0
3
réponsesQuestion
about gradient and diff
The help of my matlab says: (in article "gradient -Gradient vector of scalar function") -If x is a scalar, gradient(f,x) = ...
plus de 11 ans il y a | 1 réponse | 0
1
réponseQuestion
doing derivative using diff(Y)/dT makes the vector shorter
Hi everybody, I'm doing derivative of a curve Y-T I think it's: T = linspace(-t, t, n); Y = somefuction; dT = T(2)-T(1...
plus de 11 ans il y a | 3 réponses | 0
3
réponsesQuestion
syntax of handle: f = @(X)find(X);
Hi everyone~ I'm learning about use handle. The usual syntax is h = @FuncName But I also saw an example of f = @(X)find(X...
presque 12 ans il y a | 2 réponses | 0
2
réponsesQuestion
"find" function doesn't work
Hi~ I got a weird problem here. See the attached picture. "find" works for some values and doesn't for some others. It could a s...
plus de 13 ans il y a | 1 réponse | 0
1
réponse
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