How to read large data and plot them in matlab

2019 5 8
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更新时间：2021 8 20
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Hi. I have a file containing digit numbers with a large number of rows and three columns, generated by C program. When I use the ImportData to import them only half of the first coloumn and most of the second one are imported. The remaining get NaN. How can I import all the data of column 1 and 2 and plot them?
Thank you

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KSSV
KSSV 2019-5-8
It depends on how the file is....does it have any text after certain lines? Why don'y uoi upload your file?
Davoud
Davoud 2019-5-8
No, it doesn't.
How I should upload it? The Attachments icon doesn't work.
Walter Roberson
Walter Roberson 2019-5-8
Is it fixed width instead of space or tab delimited?
Davoud
Davoud 2019-5-8
Yes, it is fixed width.
Davoud
Davoud 2019-5-8
There is a problem with the attachment.
This is my email address: davodghn@yahoo.com
Please email to me, I send the file to you.
Thank you
Davoud
Davoud 2019-5-8
编辑：Davoud 2019-5-8
In fact, Import Data works and opens a file where three upper rows are explanations and the other ones are numbers. In order to plot, I import again the coloumn 1 and 2. They are saved in Workspace as two separeted files (vec1 and vec2) where almost all the numbers can be retrived in command window. But when I use the plot command, the resulted figure is half of the expected one. The values of bigger than 0 of x axis become NaN and are not shown in the figure.
Walter Roberson
Walter Roberson 2019-5-8
Importdata cannot handle fixed width fields except when there just happens to be one or more spaces between fields every time.
See https://www.mathworks.com/help/matlab/ref/matlab.io.text.fixedwidthimportoptions.html and readtable instead.

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Davoud
Davoud
2019-5-8

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