How to read data from file and store into matrix

Question

I have two txt files that are 1.txt and 2.txt. It stores data such as

1.txt:

P_e = [-0.1 0.71 0.88;-0.09 0.59 0.839;-0.08 0.55 0.816;-0.07 0.546 0.811;-0.06 0.46 0.769]

and data in 2.txt is

  P_e = [-0.1 0.5 0.6;-0.09 0.1 0.2;-0.08 0.3 0.4;-0.07 0 01;-0.06 0 0]

I want to cacluate sum of P_e variables column by column,except column 1 in 1.txt and 2.txt and store it into P_e_sum variable.

    -0.1    0.71+0.5    0.88+0.6
    -0.09   0.59+0.1    0.839+0.2
    -0.08   0.55+0.3    0.816+0.4
    -0.07   0.546+0     0.811+0
    -0.06   0.46+0      0.769+0

So the result is

Pe_sum=[ -0.1   1.21    1.48;
        -0.09   0.69    1.039;
        -0.08   0.85    1.216
        -0.07   0.546    0.811;
        -0.06   0.46    0.769]

Could you help me to implement it by matlab? Thank you so much

Fantastic Mr Fox · Accepted Answer · 2014-07-07 05:06:50Z

1

Its going to be hard to read those in as text. But the contents of those text files are basically formatted as matlab scripts anyway. Rename them to .m then you can just do this:

run ('1.m')
p1 = P_e;  
run ('2.m')
p2 = P_e;

pSum = [p1(:, 1), (p1(:, 2:end) + p2(:, 2:end))];

Will do what you want.

As a side note, consider not naming these files just 1.txt Matlab doesn't agree with numeric first file names.

answered Jul 7, 2014 at 5:06

Fantastic Mr Fox

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3 Comments

John Over a year ago

Thank you so much. But I think you maybe change run('1.m') to run('1').

Fantastic Mr Fox Over a year ago

@user8264 no, matlab requires .m files to work with run. You will need to rename the .txt files to .m files.

John Over a year ago

Yes. I rename that files. But i check your script does not work if uses run('1.m'). It need to use run('1')

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