1 vote
219 views

### Why Mathematica does strange thing with complex numbers [duplicate]

For example, compare the two commands below. ...
• 379
1 vote
173 views

### ContourPlot of implicit function doesn't work when I square the equation [duplicate]

When I try this ...
• 21
60 views

### Bug in Contour Plot [duplicate]

I think the following are bugs: ContourPlot[y (x - 1)^2 == 0, {x, 0, 2}, {y, -2, 10}] ...
• 369
3k views

### Specific initial sample points for 3D plots

PlotPoints lets you determine how many sample points you want in each direction, but sometimes I want specific ones. For Plot ...
• 16.6k
2k views

### What is my problem with MeshFunction?

I want plot the max value in a sine plot. We can use the following code ...
• 6,836
8k views

### Problem with ContourPlot

I tried these ...
• 143
405 views

### A particular contour does not show up, even though it is in my list [duplicate]

Consider: f = Sqrt[9 - x^2 - y^2]; ContourPlot[f, {x, -4, 4}, {y, -4, 4}, Contours -> {0, 1, 2, 3}, ContourLabels -> All, ContourShading -> None] ...
• 15k
2k views

### ContourPlot shows only part of the contours [duplicate]

Consider these contour plots: f[x_,y_]:=Cos[x] + Cos[y] ContourPlot[f[x, y] == 0, {x, 0, 4 Pi}, {y, 0, 4 Pi}] ...
• 27.7k
326 views

### How to plot this equation for $x,y$?

(1 + r^2 + x)^2 - (-1 + r)^2 ((1 + x)^2 + y^2)=0 2 (2 r^3 + (1 + x)^2 + y^2 - r (-1 + x^2 + y^2))=0 I am trying to plot $x$ and $y$ which are giving by the ...
• 474
471 views

### How to plot the contour of the radius part of a complex function

Suppose we have a complex function $f(x,y)$, in which x and y are real variables. In theory we can write the function into the polar form $$f(x,y)=r(x,y)e^{i\theta(xy)}$$ where $r(x,y)$ and \$\...
• 27.7k
457 views

### ContourPlot, problem with mesh

I have to plot this trigonometric function: ...
• 65
293 views

Consider: ...
• 15k
1 vote
611 views

### How can I get an approximate contour plot from a 3D plot?

I have some larger square, Hermitian matrices, M, (dimension 20, say, much more than 4) with 2 independent variables, call them x and y. I can plot the eigenvalues as functions of x and y with: <...
• 1,153
86 views

### Placing a contour line at y when f(x)>=y

I have an issue that the plot below drops the contour at 0. I suspect this case is special because my function is lower bounded by 0. As a work-around, I changed 0 to 0.01, but it looks jagged, any ...
• 7,905