Matplotlib Tutorial 7 – loading data from files
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Many times, people want to graph data from a file. There are many types of files, and many ways you may extract data from a file to graph it. Here, we’ll show a couple of ways one might do this. First, we’ll use the built-in csv module to load CSV files, then we’ll show how to utilize NumPy, which is a third-party module, to load files.
sample code: http://pythonprogramming.net
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you sound like a nice guy to drink in a bar for a nice chat.
This does not belong in a playlist on matplotlib if you ask me.
ValueError: could not convert string to float:
why do I get this message?
Starts from 6:40.
Hey quick question, if my text file had one x axis list, but multiple y axis lists, how would you modify the numpy code (if you need to at all?). would you just have to define y1, y2, y3, y4, y5?
I was just wondering if there is an excel file as a csv and different numbers in each row what would the delimeter be?
Seen it.
what if the csv has column label (in the first row?)
Isn’t it true that matplotlib requires numpy? So…
Dude, you are the fucking man. I wrote a program in Java that was a few hundred lines of code, and in Python it is less than 100. Insanity.
If my data consists of decimals? does the index for row change?
ValueError: could not convert string to float:
i am getting the above comment please let me know how to run code using numpy
[error:]hey,this program runs perfectly when the file is located in the python folder.BUT when i specify the path it shows "TypeError: data type "r" not understood" this error and this happens while working with (NUMPY). i hope you'll help me!
I am getting an error
IndexError Traceback (most recent call last)
<ipython-input-95-caaa25484032> in <module>()
5 plots = csv.reader(csvfile, delimiter=',')
6 for row in plots:
—-> 7 x.append(int(row[0]))
8 y.append(int(row[1]))
9
IndexError: list index out of range
I was getting the error that example.txt not found how can I resolve this?
how we will load data from excel sheet?
How can I require the user when they don't enter [number, 'comma',nuber] next by next one?
I'm using colab in ubuntu, ok? But I don't look the file, (I guess):
[Errno 2] No such file or directory: 'example.txt'
what do I do?
how can we read another python file which is already drawing graphs instead of csv.
Gracias señor
thanks for the tutorial, how do I specify more than one delimiter such as comma and space?
Thanks
Thank you very much for this tutorial, helped a lot. Can this be used for a 3d plot where i have 3 lists x,y and z, whose data is read from a file…
Is there any way to read a single line of a file with numpy?
Thx so much!! I love your videos because they are so helpful!!!
Hey, when I follow your code, for the first part I get the following error message: ValueError: invalid literal for int() with base 10:
and for the second part I get this: ValueError: could not convert string to float:
I'm using python3 on OSX and can't seem to figure out the issue.
how do you plot more than one line on the graph getting the data from a cvs file like the example from the second video on this playlist
Hi. Thanks for the video. Can u explain to me how to load .dat file ?
Hey thank you for these videos, they are really helpful. I have a question. I want to open multiple 3D image files using matplot as a subplot in the main plot. The files are in the same directory but inside the directory, there are separate folders with two files in each folder. Also, I want to analyze these files. I would appreciate your help.
How do you load a file using numpy that has more than two variables?