Tagged Questions

Questions on systematic data handling and analysis, including data correction, manipulation, or selection of user-data or built-in data available with Mathematica.

32 views

Spacing control in export

While using, for example, the code ...
607 views

Detecting components in timeseries

I'm looking at this sequence of values: I'd like to detect the points where the center of the time-series shifts (around x=1000 and x=2000). Many of the transforms and smoothing methods I have ...
122 views

WDF specification?

Motivated by a recent question on the meaning of all sorts of W* acronyms, I would like to get more information about the Wolfram Data Framework (WDF). On its web page http://www.wolfram.com/data-...
48 views

How to export data from ListLogLogPlot [closed]

I have a ListLogLogPlot, for example: data1 = ListLogLogPlot[Table[{i^2, i^(1/3)}, {i, 1, 20, 1}]] Note: I know that there is ...
263 views

Average dataset with many repetitions?

I have a dataset where each item is of the form: <|"p1" -> x1, "p2" -> x2, "r1" -> y1, "r2" -> y2|> The interpretation is this: ...
82 views

Fitting data in Log-Log scale

I want to fit my data from a txt file to a curve in log-log scale. What I tried to do was this: ...
54 views

Convert table data to Classifier data

I want to convert excel data into Classifier acceptable data. For Eg, the inbuilt Titanic data for Classifier is structured as below: {"1st", 29., "female"} -> "survived" I have 4 columns in ...
99 views

Fitting data with unique variable per measurement

Imagine we are in the following situation, we have a nonlinear system of functions $f$ with coördinates $x_i$, and unknown parameters $\delta_i$'s and $t$. Let this system be defined as, \begin{...
96 views

How to improve the nonlinear fit to a data set [closed]

Some data to begin with ...
113 views

How to plot data with domain on a circle?

I've got a list of data of the form {{0,x0},...,{359,x359}}, which represents some experimental results given in polar coordinates with fixed radius. How to plot ...
377 views

Histogram of a very large dataset?

I have a very large dataset stored in a file (over 2GB). The file contains a tab-separated table of floating-point numbers. I want to do an Histogram of all the numbers in the table. But if I try to ...
86 views

Manipulate a graph from data

I want to manipulate some data, to do this i create a graph. But i don´t know how to manipulate the data. ...
114 views

Why is TimeSeriesForecast linear?

When I use FinancialData with TimeSeriesForecast, the resulting graph is always linear and thus not very accurate. ...
95 views

FindFit and log norm function

I'm trying to fit a function to data using FindFit, but I can't find a way to replace norm function RMSE with a RMSE in log space: ...
74 views

Convert large KML coordinate datasets to UTM [closed]

I was wondering if there are ways to convert massive amounts of KML coordinates into UTM coordinates using Mathematica. Other programs would also be acceptable. Thanks. I have the KML file from ...
328 views

Integration of incomplete rings (ellipses) pattern

I am facing a problem in trying to do a series of averages in incomplete images. I have a series of X-ray data images, like this one: As you can see my image is a series of partial rings/ellipses ...
78 views

How can I access the Criterion function of KI method in FindThreshold for a dataset?

I want to find a threshold for some data set, using Kittler-Illingworth minimum error thresholding method (KI method). To do so, I use the Mathematica built-in function ...
112 views

...
100 views

How to created visualization dashboard for summary data?

I would like to create the following dashboard: The numbers indicate my desired dimensions for the cells. I would like the cells to contain a regional plot, a trend line, and bar charts. I have ...
108 views

Find intersections points with axes

Let's create some points corresponding to a simple closed curve ...
78 views

File Formats for Scientific Data

I have a simulation written in another language which currently just dumps all its data (doubles, lists of doubles, lists of lists of doubles) in lines in ASCII, and then I read it into Mathematica by ...
200 views

How to normalize histogram height to unity?

When doing Histogram[data], I get the total nummber of counts in each bin. Doing Histogram[data,Automatic,"Probability"] ...
169 views

Handling big data in Mathematica 10 [closed]

I have a huge amount of data saved in a .txt file (153 MB, ~7300000 rows). What I want in the end is a list like ...
112 views

depicting specific element of a table (knowing its position) in different color

there is some 20 Time 20 tables, in each step we choose one element randomly. how can show this random selected element with different color?
111 views

Parsing tab delimited file

Problem Description I have my data arranged in a tab delimited file and I'm trying to parse/access certain parts of it. As an example, I'd like to extract the number of points and the sampling ...
170 views

How to fit multiple Gaussian peaks to data [duplicate]

How would I fit this data with Gaussian Peaks? I have tried various codes but none have even worked. Note: If I do Log[data], the peaks are more visible (I have tried the method from here but it got ...
118 views

Fitting multiple peaks

I am using the code found here to fit multiple peaks of a large dataset which I don't know anything about. This was the only code I could find on the internet to do such a thing. So this is my attempt ...
21 views

Remove background from multipeak data [duplicate]

Let's say I have a a very large list of data in the format {{n,f[n]}} so something like {{1,600},{2,700},{3,1100}...} and if this data is plotted, then it will look like a sum of Gaussian functions+a ...
252 views

Removing background from peak function

Let's say I have a a very large list of data in the format {{n,f[n]}} so something like {{1,600},{2,700},{3,1100}...} and if this data is plotted, then it will look like a sum of Gaussian functions+a ...
91 views

Plotting cones from data read from a file

I would like to plot cones centered at specific points in a lattice and with different orientations and colors that depend on them. For this, I have the data in an external file with 11 columns: 1) ...
96 views

Data smoothing in three dimensions [closed]

I have data with statistical fluctuations of the form $f(x_i,y_i)$ over a discrete grid. I now need the values of $f(x,y)$ also at points other than the grid points. That can be achieved by ...
109 views

Collecting Data in table

I wrote a program (with help of the stackexchange) that is supposed to run in a loop. Each time the program runs, it exports a small data. Is it possible to generate a table where each run adds the ...
95 views

simple contour plot with variable thickness

I have a data set on the form of 3 spatial coordinates x,y,z and an amplitude. Here is a small crop of the data, : ...
186 views

Making large calculation results persistent

Very often, I need to do same calculations under different parameters for comparing the results. Every calculation may generate a large data set; for example, the calculation result of ...
100 views

How to import columns of data (.mat file)

I have a two 100x2 .mat file and I would like to get the elements stored as pairwise entries i.e. something like data = [{a1,b1},{a2,b2}..{a100,b100}]. Can someone help me do this efficiently?
198 views

Animating N points

So I'm trying to create an animation of N interacting particles in two dimensions confined in a box. Generating the data is fine and it's being stored in a text file with two columns for each particle;...
237 views

flipping y axis

I know that some topics were created for this subject but any solution works for me. I would like to reverse the y axis. By this I mean that I would like to have the highest values at the bottom and ...
560 views

Construct a master curve from data

I will try to be as informative as possible. Clear["Global`*"] I have the following data ...
557 views

How to extract points from a closed curve

OK, let's create a simple closed curve C0 = ContourPlot[x^2/4 + y^2/9 == 1, {x, -5, 5}, {y, -5, 5}]; and let's plot the corresponding points ...
313 views

Put markers in the maximum values in a Plot

I have made my graph of a list of data with the following code: ListLinePlot[data, PlotMarkers -> {Automatic, 10}] So this way I can see some markers in the ...
200 views

Drawing a RegionPlot but for data instead of a function

I am trying to draw something similar to RegionPlot, but instead of functions I only have data matrices. For example, I have the following 3 pieces of data (...
181 views

Use Kalman filter to predict

Here is a set of altitude data I collected with an Arduino sensor BMP-180 on a board CanSat data = {13.15, 13.4, 13.15, 13.31, 13.4, 13.31, 13.15,.....} how can ...
291 views

Import a table from a text file or string

XYScan produces results in the following form (as *.txt): ...
34 views

Help with data manipulation

I'm fairly new to Mathematica and I'm trying to manipulate some data but its not going very well. I want to import a text file into Mathematica(its a list of chapter headings and page numbers of a ...
404 views

upper envelope of data

Here is a ListPlot[] of some data. Clearly, there is a fairly smooth upper envelope - the question is whether there is an nice way of extracting it...
204 views

data manipulation in log-log scale

Say that I have the following: y[t_] := 2 + (2/10)*(1 - Exp[-t/11]) timedat = N[Table[{t, y[t]}, {t, 0, 10, 1/1000}]]; How is it possible to construct an ...
56 views

Implementing BinCounts for alphabetical structures

Is it possible to implement BinCounts for alphabets such that those alphabets which fall into the group {a,b,c,d} can be counted ...
204 views

Fitting data with interdependence

I have an issue, of which I'm not sure it can be solved, with or without Mathematica. I feel as if it should be possible, but I'm quite clueless as to how. Some introduction is required. I'm working ...