read input file Matlab - matlab

Question

I have a problem while reading an input file in Matlab. It appears that all the rows have one parameter input except for the last one which is a vector:
INPUT FILE
--------------
Field1: number
Field2: text (one word)
Field3: number
Field4: number
Field5: number
Field6: number
Field7: vector
The code I have implemented looks like:
fid = fopen('input.inp','r');
A = textscan(fid,'%s %f','Delimiter','\t','headerLines',2);
data = cat(2,A{:});
I would like some help to deal with the fact that I have some text/number cases and also to deal with the vector form the last row. Thanks

Answer 1

Is this what you are looking for...?
I think you have to use %s %s as a format to text scan and not a float because a vector cannot be converted to a float for example.
I changed this A = textscan(fid,'%s %s','Delimiter','\t'); to include %s %s.
Also, I think you want to concatenate along the first dimension rather than the second.
I think you actually want to create a key/value pair of the input file rather than just reading each row into a cell but you don't state that.
INPUT FILE
--------------
Field1: 1
Field2: two
Field3: 3
Field4: 4
Field5: 5
Field6: 6
Field7: [7 8 9]
fid = fopen('D:\tmp\t.txt','r');
A = textscan(fid,'%s %s','Delimiter','\t','headerLines',2);
cat(1,A{:})
ans =
{
[1,1] = Field1: 1
[2,1] = Field3: 3
[3,1] = Field5: 5
[4,1] = Field7: [7 8 9]
[5,1] = Field2: two
[6,1] = Field4: 4
[7,1] = Field6: 6
}
If you want to create a key/value pair, then you can split them into key and value with a loop that you can use with the Container class if needed. You have to filter your strings a bit (e.g remove colons etc) but you get the gist.
keySet = {};
valueSet = {};
for (n=1:size(A2,1))
s = A2{n};
ind = strfind(s,' ');
keySet{n} = s(1:ind(1));
valueSet{n} =s(ind(1):end);
end
The output is
keySet =
{
[1,1] = Field1:
[1,2] = Field3:
[1,3] = Field5:
[1,4] = Field7:
[1,5] = Field2:
[1,6] = Field4:
[1,7] = Field6:
}
valueSet =
{
[1,1] = 1
[1,2] = 3
[1,3] = 5
[1,4] = [7 8 9]
[1,5] = two
[1,6] = 4
[1,7] = 6
}
From the Container class doc:
mapObj = containers.Map(keySet,valueSet)