# 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.

61 views

### Extracting the data of each frame from an AVI file

What's the most straightforward way to "Import" the data of an AVI video? For instance, if I record a 30 frame per second video, then after 10 seconds I would have 300 frames. How can I import the ...
29 views

### How to use Mathematica and Wolfram Alpha for predicting football results? [on hold]

This is more of a fun question :D. At work we have been discussing and goofing around a lot on how to create algorithms in order to make predictions on the results of the upcoming UEFA EURO 2016 ...
250 views

### How to do Independent Component Analysis?

The new experimental function in 10.3.1 DimensionReduce[], has the following three options for Method: ...
368 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...
74 views

### Apply function to a part of a list [closed]

Let's say I have some data: data={{a1,b1},{a2,b2},{a3,b3},{a4,b4},...} and I would like to apply the function: f1[x_]=x*5 to ...
137 views

### Best way to include a “singularity” in a SmoothHistogram?

I have a dataset like this: data = {0,0,1.1,1.3,0,0,3.4,0,0,2.3,0,0 .....} You can imagine that data is generated from a ...
62 views

### What's the most efficient way to load a very large dispatch table?

This question is possibly related to this topic, although I think I have something a little more specific in mind. Recently I've been working with dispatch tables for a project, since it seemed like a ...
25 views

. It is often important to take data and measurements and give them a name which has a number, and manipulate them in a for loop fashion to manipulate a large data base efficently. The loop above ...
100 views

### FInding outliers in multiple dimensions

I'm working on dataset which isn't normally distributed.which contains three dimensions like cost, discount and profit I'm trying to find outliers in all these dimensions. I used z score to find ...
49 views

### KaryTree of Text .csv and Correlation

How can I make a KaryTree of this raw-data (raw-data at the end of the question): This is is data from a political survey in which I ask 5 questions with the following possible answers: Q1: 'Y'= ...
62 views

### How to run code and do data analysis in mathematica [closed]

I am a beginner in Mathematica. I'd like to do something like the following: write code- ouput- write code- output... But when I created my own notebook and copy the code above, I don't know how to ...
75 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 ...
345 views

### How does Dataset compare to DataFrame in pandas?

Pandas is a Python package providing fast, flexible, and expressive data structures designed to make working with “relational” or “labeled” data. Just like ...
97 views

### Speed up computation of sum from large matrix

I have a 3x3 matrix (252^3) of data (densities) and I want to compute a correlation xi from nearest neighbours as well as a sum involving a check whether the density is in a certain bin. The ...
131 views

### Finding mean of data sets with unequal length

I have two data sets on the form (x,y) of unequal length: ...
62 views

### Extract data from contour [duplicate]

I have a ListContourPlot, and I'm interested in extracting the data of one of the contours. Here is an example and I highlighted the contour that I would like to extract the data from: ...
35 views

### Fitting Data when both Variables Have Uncertainties [duplicate]

Does there exist a method in Mathematica for fitting some function f(x; a, b)=y (with parameters a, b) to data of the form {x, y} when both x and y have different uncertainties? It seems like it would ...
58 views

### Excluding Specific Rows Using Import[…]

As the question states, I'm trying to import a .csv file but I would like to exclude certain rows (points which I know are bad data). This is easy when the points ...
45 views

### Optimization for iterating and plotting a matrix product and its elements?

I have an iterative matrix product of this type Since i didnt knew how to do it, I explicitly wrote the product as {Ayn + Bxn, Cyn + Dxn} and evaluated it with the NestList construct ...
42 views

### How to use a picture to store some data [duplicate]

As we know.The values of the types is "Real" defaultly in Mathematica.In the Image documentation's detail we can see ...
84 views

### Fitting EV charging curve

I would like to fit my set of data (x = time and y = power) as seen below, and obtain function of x describing it as close as possible, in order to manipulate it (applying different SOC, time offsets ...
56 views

### Plotting plane from a matrix or data table

After weeks collecting data I've decided to pass my results through Wolfram Alpha and see what it gets. The results are amazingly useful, specially the plane generated by linear regression. It is ...
80 views

### Help with Time-Seried dataset

I can't seem to figure out the best way for directly inputting interpolated values into a dataset. I turn to your expertise for guidance. So, I have a multi-year time-series dataset. Column 1 is time ...
56 views

### Make Function from matrix [closed]

I have a set of excel data (time v temperature). When I extract it to mathematica it creates a matrix. I want to put the temperatures into a function that is time dependent, so is there a way to use ...
64 views

### Matching timestamped data

I bet this question is a gimme for most of you guys, but I'm having a bit o' trouble figuring it out. Thanks ahead of time for your input and help. Soooo, I have two datasets where column 1 is a ...
97 views

### Getting correct amplitudes with Periodogram

I'm having some trouble with the function Periodogram, mainly with getting it to produce correct amplitudes for the spectrum it returns. My question is how to fix ...
64 views

### Constructing the spectral density of white noise

My goal is to find the spectral density $S_{XX}(f)$ from a time domain noise signal $X(t)$. The approach should work for general time series, but to illustrate what I've been doing I'll keep it ...
52 views

### Euclidian distance matrix from a set of points [duplicate]

I have a set of points and I like to compute the (pairwise) euclidian distance for those points. The set has a form like this: ...
110 views

### Extracting Features from a List

Data: https://drive.google.com/file/d/0B7G3oUuZG1TwYWhMVUhSQzNwTEk/view?usp=sharing Here I have 20 datasets collected from custom built EMG sensors monitoring a users face. I am particularly just ...
44 views

### Save experimental data within notebook. Is it possible? [duplicate]

I'm trying to use Mathematica for all my scientific needs as much as I can, so I can learn. When I want to plot my experimental data using Mathematica, I've been Import[] and plot data sets. However, ...
57 views

### Most elegant way to plot from you data file (xy, xy, xy… format)

I have a simple question and it could be very basic tips for many. I tried to find the answer several hours by searching, but couldn't find the way yet. My question is, if I have a data set (x1y1, ...
23 views

### Mapping Functions to Associations [duplicate]

If I have the association matrix listed bellow and I want to apply: ...
70 views

### How to visualize .data files? [closed]

I am working with simulation models trying to carrying out some predictions in ocean waves and this stuff. (MITgcm) I am able to run the program and generate hundreds of .data and .meta files, but i ...
156 views

### How to create a custom histogram (normalized)

Let's create some sample data ...
75 views

### Applying a formula to the data in several files [duplicate]

I am calculating with the depth data recorded in a number of files with extension .log. The depth data is like this and I loaded it by means of Mathematica: ...
100 views

### Do Any of the filter functions perform a LOESS or LOWESS filter?

From the Data Transforms and Smoothing guide there is a link to the Linear and Nonlinear Filters guide. Do any of these filter functions perform a LOESS or LOWESS filter on set of paired data? ...
82 views

### Interpolate the discrete list into continuous function

I have a data whose list plot shows up following graph I would like to interpolate the missing data and make the function continuous but for particular x-coordinate there is multiple values of $y$ ...
785 views

### Export dataset to JSON including Unicode Characters

I'm experiencing a weird issue. Consider a dataset defined like this: dataset = Dataset[{<|"a" -> 1, "b" -> 2|>, <|"a" -> 3, "b" -> 4|>}]; ...
31 views

### Spacing control in export

While using, for example, the code ...
581 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 ...
88 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 ...
46 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 ...
260 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: ...
70 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: ...
52 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 ...
96 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, ...
329 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 ...
83 views

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

Some data to begin with ...