How to write a matrix to a text file

Attached I have the original file "hightemp.txt"

I need to create a script that Converts the text file to a matrix, adds 1900 to the first column, and then writes the matrix to a new text file called "Year2000.txt"

here is what I have tried but it says theres an error

A = dlmread('hightemp.txt');
A(:,1)= A(:,1) + 1900;
dlmwrite('Year2000.txt',A,'delimiter','\t','newline','pc')

also

A = dlmread('hightemp.txt');
A(:,1)= A(:,1) + 1900;
dlmwrite('Year2000.txt',A)

both give me an error on the dlmwrite part (we do not necessarily have to use dlmwrite)

Answer 1

[KSSV]

A = importdata('hightemp.txt') ;
A(:,1) = A(:,1)+1900 ;
dlmwrite('Year2000.txt',A)

[Blake shucart]

that also didn't work, there was an error with the import data command

[KSSV]

It worked very much in my pc.....use load instead of importdata. YOu should specify error to get help.