Questions about getting data, files, images etc. from various formats into a form that can be read, tranformed and manipulated by Mathematica

learn more… | top users | synonyms

3
votes
2answers
90 views

Most efficient way of splitting a file into length-prefixed blocks

Let's say I have a really big file (>100MB) that consists of length-prefixed blocks, i.e. the first byte of each byte block indicates the length of the rest of the block. This is a simplified example ...
1
vote
1answer
95 views

Importing, sorting and exporting lists

I have several TSV lists (.txt) of something like 2000*2000 numerics (e.g. 1.8645) to import ...
0
votes
0answers
15 views

import part of data [duplicate]

I am using the following code for importing multiple files. ...
0
votes
1answer
83 views

Having trouble displaying imported Excel regression data [closed]

The plot points and residual lines are not showing, hard-coded data works, and imported data does do something, just not what its supposed to Is the table or the plot range the wrong size? I can't ...
0
votes
0answers
43 views

How to import (from a table file) only rows with a specific element in a given position using Import?

I have a large file containing a table. To be specific, the table columns are aligned by spaces, and the rows are terminated by newlines. I want to import only specific rows from this table. For ...
0
votes
0answers
39 views

Code to import and export “.cine” image format?

I need to work with a set of experimental data in the form of ".cine" format image files. This is a data format developed by Vision Research for high-speed imaging and video. I would like to import ...
10
votes
4answers
495 views

Exporting data extensions in fits file

Context In Astronomy the de facto standard for images and data is FITS. I would like to export heterogenous data sets into a single fits file. Attempt I am ...
1
vote
1answer
49 views

Dynamic check box with import!

Here what i am trying to do: I have a list of the names of excel files, for example s={"red carpet.csv","red box.csv","black carpet.csv","black box.csv"}; i am ...
3
votes
2answers
260 views

Equivalent of Matlab's uigetfile in Mathematica

I was wondering if there an equivalent of the "uigetfile" Matlab function to use it in Mathematica. To be more precise, I want to read many Excel files and I don't want to type a static path; ...
7
votes
2answers
902 views

How do I display imported images at actual size?

I know that this is an extremely basic question, but I am having a lot of trouble finding the answer in the documentation. When I import an image (for example, ...
2
votes
2answers
111 views

How to rearrange structure and type of an imported dataset?

I have a bigger dataset imported from Excel. Its elements have a form of {time, data}. Day is irrelevant and I would like to have the time in decimal form e.g. 10:30 is 10.5 ...
0
votes
2answers
106 views

Import table from txt file with specific rows

I have a .txt file written as 1 2 3 4 5 6 7 8 9 10 11 12 I would like to import it as three matrices according to the rows. I used b = Import["d:\am.txt", {"Table", Range[1, 2]}] Seems it ...
2
votes
1answer
202 views

How can I download images from Instagram and Twitter?

The new function ServiceExecute seems to suggest the ability to download images containing a specific hashtags. Can anyone get this to work?
0
votes
0answers
90 views

Set first line in CSV as header in mathematica list

New to stackexchange. Need some help with mathematica - also new to this!. I have a CSV file with 80 something columns and 6000 something rows = 500,000ish elements in total. I am trying to import ...
0
votes
1answer
74 views

reading data, one number at a time, from file to be used in a formula

First off let me say that I am a total nube. I saw some examples of answers "close" to my question but I did not understand them :-( I want to read individual numbers in from a text file and have ...
0
votes
1answer
56 views

How to get an elements of given class that generated by javascripts

I want to get the number of total pages of a given search resluts of this site: http://srh.bankofchina.com/search/whpj/searchen.jsp, e.g., from 2015-1-12 to 2015-1-13 the currency of USD by the ...
0
votes
2answers
394 views

Import a given column from an excel file? [closed]

It seems that I can get the first column of excle data, say "test.xls", if I know the total length... ...
2
votes
1answer
93 views

Local evaluation works, CloudDeploy did not work

I a playing around with my programming cloud account. What I have found, interactive functions often are not working because there are several details that are not implemented into the cloud. So I ...
0
votes
0answers
65 views

ViewPoint: Saving coordinates in a text file

How should I save (Export?), all coordinates of the ViewPoint, in a text file when I rotate the ...
3
votes
1answer
186 views

Using the variable in the MATLAB workspace using MATLink or any other packages

I have a program in MATLAB and after I run the program, I get some results in MATLAB's workspace. Now, I need to use these results in Mathematica. What I currently do is that I save the workspace as a ...
1
vote
1answer
358 views

Import symbolic variables from Matlab with MATLink

I'm trying to manipulate with Mathematica symbolic expression created in Matlab. I'm using the MATLink package, and I've succedeed in importing numerical variables, but not symbolic ones : ...
1
vote
1answer
88 views

Importing a text file

I have a *.txt file with values like so: 0 2 4 3 4 2 the position in this huge *.txt ...
15
votes
2answers
693 views

Get both output and return code of external program

Run["program"] will run an external program and return the return code. Import["!program", "String"] will run the program and ...
21
votes
4answers
3k views

Importing a large Excel file

I'm trying to import a simple Excel file containing 94,000 rows and 52 columns of various types, mostly Reals. It's a 38-MB file. I get this super helpful error ...
5
votes
0answers
1k views

Import Large Excel File

Currently, I am working on a large time series dataset, which contains 928,586 rows and 35 time intervals in columns, in excel format (.xlsx) and using Import to ...
1
vote
0answers
154 views

Import/Export a FIT file, Fitness file created by Garmin GPS's and others

A FIT file is a binary replacement for GPX and TCX text files containing GPS and fitness data (heart monitors, etc.). Mathematica reads GPX and TCX files and represents them as XML. I would like to ...
7
votes
1answer
104 views

Is it possible to move .mx file from one server to other?

I have mathematica file in one server along with .mx file. Is there any way to move the .mx file from one server to other such ...
2
votes
1answer
123 views

How to get a audio file's duration time in Mathematica?

I have a *.avi file and if I want to know the file's duration time: I can use this code to get the result: Import["test.avi", "Duration"] or the code to get the ...
7
votes
1answer
249 views

Assign the contents of a “Copy” operation programmatically to a variable?

While an earlier question Cut and paste data from a spreadsheet nominally addresses the issue, a year has past since its OP asked it and I hope that others have come across simpler or more direct ...
2
votes
4answers
3k views

Plotting a large number of data points

I would like to know how to plot when I have a large number of points (arround 600) in a specific format: ...
3
votes
3answers
510 views

Import data from first/last 100 rows of a file

If one wants import data from the first three rows of a file "myfile.data", one can use the command Import["myfile.data",{"Data",{1,2,3},All}]; However, if I ...
1
vote
2answers
80 views

Table operation after export and import of data does not give me the same result

If I create a table of this kind: (m1 = Table[{RandomInteger[], RandomInteger[{1, 5}, {3}]}, {i, 1, 5}]) // MatrixForm which looks like I know how to pick ...
1
vote
1answer
65 views

List Manipulation and Removing Cases

I've imported a large data set, manually removing headers in the .rtf file where it originates. However, when I import this data, I receive this output: ...
5
votes
0answers
192 views

ImportString JSON possible bug

My problem is when I catch up some json output of whatever method and process it with ImportString[%, "JSON"], The first time ...
1
vote
2answers
111 views

Save file from URL using mathematica

Is there an easy way to download and save a .zip file from a URL to my computer through Mathematica? I am trying to develop an auto-update function for a mathematica package that is distributed via ...
0
votes
1answer
55 views

Elegant ways of solving this file batching task

There are a batch of data files in a folder (dir = "D:\\Documents\\datadir"), each of which consists of a list of data items, one per line. Each data item is a pair ...
39
votes
5answers
5k views

How can I extract data points from a black and white image?

Consider the following graph (source): Is there any way to extract the data points from this image in a semi-automatic way? I have seen, and tried the methods suggested in this question, but they ...
8
votes
1answer
202 views

How to use RunProcess to import external function?

I have a functions written in an external language called GO. How can I quickly load them into the kernel for use as Mathematica functions? The two ways I've tried are with MathLink and LibraryLink ...
0
votes
2answers
81 views

File Handling. How to save the progress in a file?

Assuming I already have the file created. I have a programme that,returns an output, in our case number. I want Mathematica to save this number in a file, together with results saved from previous ...
8
votes
4answers
893 views
16
votes
1answer
1k views

How to programmatically extract mathematical formulas from Word with Mathematica 9?

I have a bunch of(1000+) Microsoft Word document in .Docx format. How can I programmatically extract the mathematical formulas from MS Word using Mathematica 9? This is what example looks like (or ...
0
votes
1answer
123 views

how to read an excel file using mathematica? [closed]

I have to do some data analysis and i have data in an excel file. Please tell me how to read an excel file in mathematica.
3
votes
1answer
229 views

Efficiently reading CSV with ReadList

I have a large CSV file (~1gb) with mixed data. Basically with strings and integers. It takes very long to import this whole dataset with Import[] so I would like ...
4
votes
1answer
274 views

CSV vs XLS for import

I need to import data from various database sources. At the moment I plan on importing files via a CSV file or XLS. All the data if in XLS would be on one sheet (notebook). Are there any advantages ...
4
votes
0answers
103 views

Import Excel data forcing links (ie workbooks) to be updated

We have noticed importing data from an Excel spreadsheet doesn’t update links. The problem with this is if you import a spreadsheet that comprises of linked workbooks data and those workbooks have ...
8
votes
3answers
2k views

Skip header lines on import

When importing a data file what are the comment symbols for Mathematica? That is, given a file like this blabla bulbul 1 2 6 54 7 ... .. what symbol do I have ...
1
vote
3answers
261 views

How to import files with headers?

R has excellent header supports such as read.table with header options. I don't want to mess up with text-processing or stream-processing. I am looking for a similar tool as in R because it saves a ...
7
votes
1answer
217 views

Incorrect result while using SemanticImport for CSV file import

I might use this incorrectly. I want to use a .csv file that (as list) looks like: ...
1
vote
0answers
187 views

InstallJava::fail error when importing an image with a Raspberry Pi

I'm trying to import an image in Mathematica on my Raspberry Pi. The code is simple but I get an error when importing: ...