Questions tagged [plotting]

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1answer
51 views

How to use cumtrapz correctly?

I have tried to do a trapeze integration with f(x)=x^2, where I know how the antiderivative looks like, so F(x) = (1/3)x^3 Here's my code, just like I tried: ...
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1answer
44 views

Bode diagram without bode() function

Is there any way to make a bode plot without using the MATLAB/GNU Octave function bode()? As an example, here is a function I am working on: $$H(s) = \frac{1}{2s^...
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1answer
57 views

Plotting the difference between an exponential and its Taylor expansion as a function of number of terms?

I'm terribly green, please forgive me. I need to plot the difference between a chosen calculated Taylor expansion $e^x=1+x+\frac {x^2}{2!}+\frac {x^3}{3!}+\frac {x^4}{4!}+\frac {x^5}{5!}$... and the ...
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1answer
46 views

Using Axis Equal for Matlab simulation plots of the SIR model gives very flat solution curves

My professor taught us to always use the Matlab command axis equal for our simulation data plots - for all of our homework assignments. However, in studying the ...
2
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1answer
53 views

How to plot a heatmap under a curve?

If I were to have a data for a one-dimensional system evolving in time, essentially a two-dimensional array, and the array at each point in time is of the same size, how would I produce something like ...
-1
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1answer
55 views

Plot of a function involving an integral and value changing parameters [closed]

I'm trying to plot the cross section with respect to the photon energy $h\nu$ but for $\gamma = 1.0, 1.2, 2.0 $ in the same axes $\sigma = \left[\left(\frac{\xi_{eff}}{\xi_{0}}\right)^2 \frac{n_r}{\...
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2answers
49 views

contour plot of cloud of points [closed]

I have a cloud of points scattered in a rectangle and some data in this points, a bit like this $$ x(:)=[x(1), x(2), ..., x(N)] \\ y(:)=[y(1), y(2), ..., y(N)] \\ u(:)=[u(1), u(2), ..., u(N)] $$ ...
3
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1answer
58 views

Estimation of viscosity from critical properties

The above graph represents reduced viscosity as a function of reduced temperature for several values of the ...
1
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0answers
106 views

How to set the errorbars in a different color from the plot in Matlab? [closed]

When making a plot in Matlab using errorbar(...) the color of the error bars is the same as the plot. How do I set them to be in a different color? I tried looking ...
3
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2answers
434 views

Graphing electric potential of a ring of charge using MATLAB help

Here is a summary of what I am trying to do: Use MATLAB to compute the potential $V$ at any point $(x, y, z)$ in space due to a uniform ring of charge. Use a Riemann sum to compute the integral ...
0
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1answer
67 views

Monte Carlo - Random Walk Simulation - polyfit the log log data points?

This is part of the code in matlab for a random-walk simulation. To test the code, I'm using steps=[30]; there will be more values, but I want to run it for 1 trial to decrease code processing. <...
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1answer
217 views

Gnuplot: How can I determine the maxima of a fit function in gnuplot?

I have a set of data data.txt which can be fit to a Gaussian function, f(x). I want to determine the coordinates of the point of ...
1
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1answer
897 views

Efficiently plot a finite element mesh solution with Matplotlib

I am looking for the most efficient way to plot a mesh using Matplotlib given the following information, coordinates of each node, what nodes belong to each element, and the value each node has. Below ...
1
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1answer
76 views

SciPy 3d plotting Integral of $\int x^y dx$ for $y$ in $[-4,4]$

Ideally, I would like to get the symbolic/algebraic integral of the function and plot the resulting surface in 3d. I am not sufficiently versed in SciPy to know if this is even really possible.
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2answers
107 views

Plot a multi-variable equation in (discontinuous) regions

The goal is to display the relation between K and E in the following equation: $$\cos(K) = 5 \text{sinc}( 5.12\sqrt{E} ) - \cos(5.12\sqrt{E} )$$ The intended result is: However, using the following ...
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1answer
78 views

How to report non-monotonic runtimes in convergence plots

Let's say I have an algorithm that can be tuned by a parameter $h>0$ and is expected to converge as $h\to 0$. I want to study the computational complexity of this algorithm, i.e., how the ...
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0answers
1k views

Software for easy spherical coordinate plotting from data file

Does anyone have any suggestions for good open source plotting software which has good graphical spherical coordinate plotting (from a data file). I have a three column data file where column 1 is $\...
0
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1answer
55 views

Plotting using 'colorbar' in MATLAB [closed]

I am trying to plot a figure similar to the one attached here,I tried searching how to do a similar kinds of plot and i found about 'colormap','colorbar' in MATLAB. Actually I want to plot this ...
1
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1answer
752 views

Strong scalability plot, HPC

I have to create a strong scalability plot, which measures the execution time for a numberOfThreads =1,2,4,8,16 with size=1024. ...
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1answer
72 views

Plotting the same function multiple times on the same set of axes but with different parameters [Python]

I am currently trying to plot a function which describes linear perturbation growth in cosmology for different world models. I would like to be able to have all the curves on the same set of axes, but ...
1
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1answer
326 views

Plotting Excel data with Julia [closed]

Let me first be clear that I'm still new to Julia. I need to plot time series data contained in an Excel file using Julia. So far I couldn't find any packages for that. The only workaround I found ...
2
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1answer
266 views

Contour plot of a scalar function over the complex domain in MATLAB

I'm trying to make a 2D contour plot of a function with a complex input and a real output, namely: $f(z=x+iy)= |z^2-3z|$, on MATLAB. I want to make a contour plot of f, such that the axes are $(x,y)$, ...
1
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1answer
478 views

2d slice cut of tetrahedral mesh in tecplot 360 ex [closed]

I have made a 2d slice cut of a 3 dimension figure. When I select "mesh" to display the mesh on the slice, tecplot seems to connect the vertices in a strange way (it seems like two 2d meshes are ...
1
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1answer
444 views

3-dimensional plotting with nonuniform grids

I have 3 variables I am considering: time (t), 1-dimensional space (x), and intensity (I). I would like to plot the intensity in the z-axis as a function of t and x (the latter two variables would ...
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2answers
408 views

Generating 4D Plots in Matlab

I have some data in the form of: ...
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1answer
210 views

Nice plot of f(x)

A user has this nice graph of f(x) on his profile and I want to learn how to do it in matlab or Gnu octave. ...
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1answer
287 views

How to plot selection over time for only components, but not magnitute. of a vector in paraview?

I am doing a time evolution analysis for a structure and have already got the displacement result, which is a vector including x and y components. And I want to plot the time evolution of x and y ...
4
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1answer
1k views

What determines the usual chemistry textbook plots of atom orbitals?

In elementary chemistry textbooks you often have pictures like the following one: Are there any conventions how to get them? I am not sure, but I guess that it are contour plots with only one iso-...
1
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1answer
483 views

How to make scatter plots of scalar fields with free software?

How can I make a scatter plot like the following, where the density of points represents the magnitude of the scalar field at that point. Consider for example the probability density for an atom: I ...
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3answers
647 views

How to plot a price level matrix in Matlab?

I have a matrix P of m rows and n columns. P(i,j) contains the price of occupying position i at time j. I want to plot this in Matlab but in a way to get some kind of density plot with different price ...
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2answers
3k views

Having smoother contour plots in MATLAB

I have a $80\times200$ matrix, and I want to plot its contents with the contourf command in MATLAB, as follows: \begin{align} &\text{[C,h] = contourf(mat,100);}\\ &\text{set(h,'LineColor','...
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3answers
91 views

Software recommendation for plotting data from lab tests

I have several files of data created by LabView of hydraulic pressure testing over the course of a few days. This data is mostly time with various pressure and temperature measurements. Can you ...
1
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1answer
206 views

How to change level of contours in animation for Tecplot360

I am working on a transient heat transfer problem. The problem that I have is as the time goes the range of temperature is changing but Tecplot only use one sort of levels for contour for all of time ...
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1answer
89 views

Visualise data under Tecplot

I have a set of data that I need to visualise under Tecplot, the file format is for example: ...
1
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1answer
355 views

Satisfying Periodic Boundary Conditions while plotting spherical particles inside a cube

I am trying to plot spherical particles in a cube of fixed dimension in matlab. I face a problem here where the center of the sphere is too close to the edge of the cube in this case the rest of the ...
2
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2answers
565 views

Should a colorbar have constant values throughout a simulation?

The default option for matplotlib's pcolormesh (also true for VisIt and I think also true for Matlab) is to allow the maximum and minimum of a colorbar vary. Which ...
1
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0answers
108 views

How to curve fit an unknown function?

I have data which can be described by $y=f(x,z)$ where $z$ varies from 170 ~ 154. Now values given by $ks$ are known sample values that equals value given in the table header, $uks$ are unknown ...
2
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2answers
83 views

Adaptive plotting of two-variable functions $z=f(x,y)$ algorithm pseudocode?

I am looking for explanations of algorithms to adaptively sample a function of two variables $f(x,y)$, in a given domain $x_0\le x \le x_1$, $y_0\le y \le y_1$. Intuitively, I want to sample more ...
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2answers
1k views

How to calculate grid coordinates of the centroid based on four attributes in a spider chart

04/06/15 After more research I found a candidate algorithm but it seems to be incomplete. I have also reworked the spider chart to number all of the boxes using an x,y ((origin = 1,1) lower left) ...
2
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1answer
184 views

How to plot feasible design space of a Generic Multiobjective Optimization problem?

As you know, a generic Multiobjective optimization problem can be stated as follows: $min{\space}F(\bf{X})=[f_1(x),...,f_n(x)]$ $h_k(x)=0{\space\space\space} k=1,...,n_e$ $g_i(x)\leq0{\space\space\...
1
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2answers
73 views

Help on writing sofware: general guidelines, in particular separation of computation and visualization

Although I already did some work in the intersection of theory and simulation I'm still very new to this field and I need some guidance. If anybody can give some recommendations for introductory ...
2
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1answer
2k views

2D cross section from 3D surface

I am trying to apply the "restoring force surface" method to a dynamic linear system. The idea behind this method is that, knowing acceleration, displacement, velocity and input force it is possible ...
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0answers
647 views

Plotting renormalization group flow diagram from recursion relation [closed]

How do I plot a flow diagram (given certain initial conditions, the trajectory in y-x space) for a RG (renormalization group) flow given by the following recursion relations? \begin{eqnarray} x^{\...
2
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2answers
227 views

single-variate function variational Intensity Plot for Matlab

I'm wondering if it's possible to create functional intensity plots in matlab. Examples of what I'm looking for are below found in this paper: These figures were (guessing) probably made in R, but is ...
2
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1answer
4k views

Plot a surface from data sets in MATLAB

I tried to plot a surface in MATLAB but, since it is the first time I had to do something like this, I need a confirmation on the process I followed because it is important for my project to plot the ...
0
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1answer
446 views

How to plot function with evenly spaced x values in Matlab

I'm trying to plot this function func=exp(x-sqrt(2))-cos(x-sqrt(2))-(x-sqrt(2)) in Matlab using 101 evenly spaced x values. If I just say ...
6
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2answers
2k views

How can one produce a proper streamline plot?

I recently had trouble producing a proper streamline plot in Mathematica, and apparently the problem is a good bit harder than I appreciated. I would like to know if there exist general algorithms to ...
4
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2answers
7k views

Visualising Maxwell's equations using MATLAB

I asked this question to help me understand what is going on in one of Maxwell's equations. I am happy with following through the maths on paper now, but would like to use MATLAB to take it one step ...
1
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0answers
972 views

algorithm Matlab function 'stream2' and 'stream3' use to compute streamline

Can anyone explain how the MATLAB functions: stream2(x,y,z,u,v,startx,starty) and stream3(x,y,z,u,v,startx,starty) compute stream lines from vector data u and v? In the stream2.m file, it calls the ...
0
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1answer
894 views

Border Mapping of Scatter plot

I have scatter plot and I want to trace the border of that. for example: Plot: and I wanted it traced: Or at least wanted to know the border points? Also, is it possible to detect if any point ...