how edit and write into particular line consisting of letters and numbers text file using matlab?

1 次查看（过去 30 天）
raghavendra g g
raghavendra g g 2017-3-2
评论： raghavendra g g 2017-3-2
** BOUNDARY CONDITIONS
**
** Name: Surf_temp1 Type: Temperature
*Boundary
Surf_temp_Set-1, 11, 11, 100.
** Name: Surf_temp2 Type: Temperature
*Boundary
Surf_temp_Set-2, 11, 11, 100.
** Name: Surf_temp3 Type: Temperature
*Boundary
Surf_temp_Set-3, 11, 11, 100.
** Name: Surf_temp4 Type: Temperature
*Boundary
Surf_temp_Set-4, 11, 11, 500.
This is text file to be edited. How to search particular boundary condition and edit and write to new text file?..Suppose I want to change
*Boundary
Surf_temp_Set-4, 11, 11, 500.
as
*Boundary
Surf_temp_Set-4, 11, 11, 350.

请先登录，再回答此问题。

采纳的回答

KSSV
KSSV 2017-3-2
f= fopen('your data in text file');
c = textscan(f,'%s','delimiter','\n');
fclose(f) ;
S = c{1} ;
%
str = {'Surf_temp_Set-4, 11, 11, 350.'} ; % to be replaced
str1 = strsplit(str{1}) ;
% get the index which is to be repalced
idx1 = find(not(cellfun('isempty',strfind(S, str1{1}))));
% Repalce
S(idx1) = str ;
% write to a rext file
fid = fopen('file.txt','w') ;
fprintf(fid,'%s\n',S{:});
fclose(fid) ;
  1 个评论
raghavendra g g
raghavendra g g 2017-3-2
Thank you KSSV. In this line Surf_Set_4, 11, 11, 350.... the last number 350 need to be updated for every iterations like it changes to 400,500,600,700. how to do this?

请先登录，再进行评论。

更多回答（1 个）

Walter Roberson
Walter Roberson 2017-3-2
Unfortunately, the only way to update a text file in MATLAB is to read in the old file, make whatever changes you need, and write out a new file containing the new content.
It is safer to always write to a different file, not the input file, in case something goes wrong during the writing (bug, system fails, disk fills up.)
This inability to effectively update a text file in place is due to the way that text files have been represented in nearly all systems since about the time that room-sized computers started being replaced by smaller computers.

类别

在 Help Center 和 File Exchange 中查找有关 Characters and Strings 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by