How to read large data and plot them in matlab

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Davoud 2019-5-8

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关闭： MATLAB Answer Bot 2021-8-20

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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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 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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