writing text files with mix of variables and strings

Question

Rae Taylor-Burns 2020-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/546128-writing-text-files-with-mix-of-variables-and-strings

回答： Rik 2020-6-11

采纳的回答： Rik

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Hi all,

I am trying to write a text file with the following code:

% Vegetation
veg_height = 1;
veg_dens = 0.5;
stem_diam = 1;
cd_factor = 1;
% Low marsh
npts = 1;
nsec = 1;
ah = 0.16 * veg_height;
bv = 0.0027 * stem_diam;
N = 312 * veg_dens;
Cd = 0.34 * cd_factor;
C = {'npts = ' [npts];
    'nsec = ' [nsec];
    'ah = ' [ah];
    'bv = ' [bv];
    'N = ' [N];
    'Cd = ' [Cd]};
D = C';
fid = fopen('lowmarsh.txt','wt');
fprintf('%s' ,D{:})
fclose(fid)

What I want is a text file called lowmarsh.txt that looks like this:

npts = 1

nsec = 1

ah = 0.16

bv = 0.0027

N = 156

Cd = 0.34

But my text files are coming out empty.

Can someone please help me to figure out what I am doing wrong?

Thank you!!

Rae

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Answer 1

Rik 2020-6-11

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The reason your file is empty is that you forgot to supply the fid to the fprintf function, which causes it to print the text to the command window instead of the file.

% Vegetation
veg_height = 1;
veg_dens = 0.5;
stem_diam = 1;
cd_factor = 1;
% Low marsh
npts = 1;
nsec = 1;
ah = 0.16 * veg_height;
bv = 0.0027 * stem_diam;
N = 312 * veg_dens;
Cd = 0.34 * cd_factor;
C = {'npts = ' [npts];
    'nsec = ' [nsec];
    'ah = ' [ah];
    'bv = ' [bv];
    'N = ' [N];
    'Cd = ' [Cd]};
D = C';
fid = fopen('lowmarsh.txt','wt');
fprintf(fid,'%s' ,D{:})
%       ^^^^ add this
fclose(fid)

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Answer 2

Sujay C Sharma 2020-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/546128-writing-text-files-with-mix-of-variables-and-strings#answer_449558

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Hi,

Have a look at the writecell function. I think using this should help you get your desired output.

Here is an example of how you can use it:

% Vegetation
veg_height = 1;
veg_dens = 0.5;
stem_diam = 1;
cd_factor = 1;
% Low marsh
npts = 1;
nsec = 1;
ah = 0.16 * veg_height;
bv = 0.0027 * stem_diam;
N = 312 * veg_dens;
Cd = 0.34 * cd_factor;
C = {'npts = ' [npts];
    'nsec = ' [nsec];
    'ah = ' [ah];
    'bv = ' [bv];
    'N = ' [N];
    'Cd = ' [Cd]};
writecell(C,'lowmarsh.txt','Delimiter','tab')