want to read 38 csv files only first and second column?

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muhammad choudhry
muhammad choudhry 2020-10-27
评论： KSSV 2020-10-27
Hi,
I want to read first and second coloumn of the 48 .csv files then plot the data from them coloumns. Once data plotted seaparately then want to apply the circle algoritham to it which will give me the estimated radius of the circle in list or array then I want to plot them against time?
Can you guys help I do not know how to read column 1 and 2 of them 48 files?
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muhammad choudhry
muhammad choudhry 2020-10-27
编辑：muhammad choudhry 2020-10-27
file names are like contours0.90....till contours0.137......I have attached the few files only wants to read first 2 columns which represents x and y values of the plot ...z -axis values are not needed which is 3rd column.
muhammad choudhry
muhammad choudhry 2020-10-27
and this a algoritham code which will then applied to find the radius of the circle I can do manually one by one but that's not a goal.

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采纳的回答

Sudhakar Shinde
Sudhakar Shinde 2020-10-27
编辑：Sudhakar Shinde 2020-10-27
csvFile = dir("*.csv") ;
N = length(csvFile) ;
for i = 1:N
data = readtable(csvFile(i).name) ;
iwant = data.Points_0;
iwant1 = data.Points_1;
% do what you want
end
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muhammad choudhry
muhammad choudhry 2020-10-27
what does this line representing ? data = readtable(csvFiles(i).name) as I am getting error in this line does anything req. to change here ?
Unrecognized function or variable 'csvFiles'.
Error in SimuCircle (line 7)
data = readtable(csvFiles(i).name) ;
Sudhakar Shinde
Sudhakar Shinde 2020-10-27
编辑：Sudhakar Shinde 2020-10-27
it was typing error.
use csvFile instead of csvFiles. Corrected in above code lines.

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更多回答（1 个）

KSSV
KSSV 2020-10-27
编辑：KSSV 2020-10-27
csvFiles = dir("*.csv") ;
N = length(csvFiles) ;
for i = 1:N
data = csvread(csvFiles(i).name) ; % also read about xlsread
iwant = data(:,1:2) ; % read first two columns
% do what you want
end
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Sudhakar Shinde
Sudhakar Shinde 2020-10-27
Name of csv file contains multiple dots , example: contours0.90.csv and looks like csvread producess error for this.
Use readtable or readmatrix instead.

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