CSV，逗號分開的文件，如果能快速的讀取這些文件中的數據，無疑會幫助我們解決很多問題。

1、 只有數據的CSV文件，CSV file that includes only numbers.

As an example, create a text file, named as 'data.csv' if you prefer, which includes the following data with any editor you like.

1, 2, 3, 4

5, 6, 7, 8

9, 0, 1, 2

1) Read all the data into a 3X4 matrix.

Mat = csvread('data.csv');

disp(Mat);

2) Read part of the data with specification of the start index. What is important is the data is accessed from index 0 in the direction of row and column.

Mat = csvread('data.csv', 1, 2);

disp(Mat);

Result showing below.

7 8

1 2

3) Read only the specified range.

Mat = csvread('data.csv', 0, 1, [0,1,2,2]);

disp(Mat);

Note the starting index you specified in the second and third parameters is the same with the first two arguments in the fourth parameter matrix.

2、 How to read a CSV file containing string data items.

Create a file, named as 'datastr.csv' if you like. Add the following data.

1, 2, 3, Mine

4, 5, 6, Yours

7, 8, 9, His

One who try to use csvread shall encounter frustration. :(

I propose another solution to solve this case.

fid = fopen('datastr.csv');

dcells = textscan(fid, '%f, %f, %f, %s');

fclose(fid);

dcellneeds = dcells(1:3);

Mat = cell2mat(dcellneeds);

disp(Mat);

The result showing below.

1 2 3

4 5 6

7 8 9

Try it and good luck.

總結

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