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

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:...

más de 5 años ago | 0 answers | 0

Answered

number 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 ...

number 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 ...

más de 5 años ago | 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...

más de 5 años ago | 4 answers | 0

Question

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...

casi 6 años ago | 2 answers | 1

Question

access values in dataset

hi In the results of lm = LinearModel.fit(x, y) there is lm.Coefficients containing the coefficient values. E.g., >...

casi 6 años ago | 2 answers | 0

Question

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...

casi 6 años ago | 2 answers | 0

Question

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...

alrededor de 6 años ago | 0 answers | 0

Question

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...

alrededor de 6 años ago | 1 answer | 0

Question

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...

más de 6 años ago | 1 answer | 0

Question

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...

más de 6 años ago | 1 answer | 0

Question

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...

más de 6 años ago | 1 answer | 0

Question

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 ...

más de 6 años ago | 0 answers | 0

Question

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...

más de 6 años ago | 0 answers | 0

Question

-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...

casi 7 años ago | 1 answer | 0

Question

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...

casi 7 años ago | 1 answer | 0

Question

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 ...

casi 7 años ago | 3 answers | 0

Question

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....

casi 7 años ago | 0 answers | 0

Question

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...

alrededor de 7 años ago | 0 answers | 0

Question

genvarname -> Index exceeds matrix dimensions.

Hi everyone~ I have a quite stupid question here. genvarname doesn't work here, like this: >> vname = genvarname ('aaa'...

alrededor de 7 años ago | 1 answer | 0

Question

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...

alrededor de 7 años ago | 1 answer | 0

Question

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~ ...

alrededor de 7 años ago | 3 answers | 0

Question

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) = ...

alrededor de 7 años ago | 1 answer | 0

Question

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...

alrededor de 7 años ago | 4 answers | 0

Question

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...

alrededor de 7 años ago | 2 answers | 0

Question

"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...

casi 9 años ago | 1 answer | 0