无法使用textread在Matlab中读取文件数据

Question

I'm trying to read a .samp file's data in Matlab with the textread function. I want to put each row of the file in an array. This is the .samp file:

@CATEGORY:GENERAL
@IMAGE:2012-04-26-Muenchen-Tunnel_4K0G0010.JPG
# format: id type center.x center.y size.width size.height angle
0 30 1319 2338 35 11 56.451578
1 30 1337 2350 42 14 57.817368
2 30 224 3556 61 20 136.967797

When I try to run this command:

[id, type, x, y, width, height, angle] = textread('data', '%d%d%d%d%d%d%f', 'headerlines', 3);

it doesn't work and gives an error:

Error using dataread

Trouble reading integer from file (row 1, field > 1) ==> % CB = DATA(OBJ, 'get_callbacks') returns a

Error in textread (line 174)

[varargout{1:nlhs}]=dataread('file',varargin{:}); %#ok

How should I type the command to run correctly? and what should I do afterwards to put each row (line) in a separate array?

Answer 1

Try to specify the full file path as the first argument. For me, putting data in C:\\Users\\MyUsername\\ and then calling

 [id, type, x, y, width, height, angle] = textread('C:\Users\MyUsername\data',...
                                                   '%d%d%d%d%d%d%f',...
                                                   'headerlines', 3);

was pretty much enough to make it work. However, Matlab documentation suggests switching textread to textscan , so you should probably consider that.

As for the second part of your question: do you actually expect to have just three lines in you file? If not, you could put all your column vectors into a matrix and access horizontal vectors by slicing:

M = [id type x y width height angle];
M(1,:) %  first line of your file

However, if you do expect to have just three lines, you could use

vec1 = [id(1) type(1) x(1) y(1) width(1) height(1) angle(1)];
vec2 = [id(2) type(2) x(2) y(2) width(2) height(2) angle(2)];
vec3 = [id(3) type(3) x(3) y(3) width(3) height(3) angle(3)];