# Export a matrix to a txt file

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Kasper 2015 年 6 月 12 日
コメント済み: Kasper 2015 年 6 月 15 日
Hello
We are trying to export two matrices to a .txt file. Tried several things but it doesn't seem to like symbolics. The code is like this:
clear all
% end points
X = [0 1];
Y = [0 0];
% intermediate point (you have to choose your own)
Xi = mean(X);
Yi = mean(Y) + 1/250;
Xa = [X(1) Xi X(2)];
Ya = [Y(1) Yi Y(2)];
t = 1:numel(Xa);
ts = linspace(min(t),max(t),numel(Xa)*10); % has to be a fine grid
xx = spline(t,Xa,ts);
yy = spline(t,Ya,ts);
plot(xx,yy); hold on; % curve
plot(X,Y,'or') % end points
plot(Xi,Yi,'xr') % intermediate point
syms L K
XA=yy*L;
YA=xx*L;
KPNR=(1:numel(Xa)*10);
key(1:numel(Xa)*10)=K;
A=[key;KPNR;XA;YA];
B=transpose(A);
BLA(1:numel(Xa)*10)=L;
z1=(1:numel(Xa)*10);
z2=(2:numel(Xa)*10+1);
H=[BLA;z1;z2];
N=transpose(H);
What we want, is to generate some keypoints for ANSYS. For the convenience, we want to include K and L, since it is commands in ANSYS. What we want is MATLAB to export the A and N matrices to two seperate .txt files without the '[ ]' but with the ','. But can't seem to find a workaround for the symbolics. We're not that experienced with Matlab unfortunately.

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### 採用された回答

Anthony Poulin 2015 年 6 月 12 日
Hello,
I give you this short code:
fileId = fopen('MatrixA.txt', 'w'); %To create a file
txtA = char(A); %To convert the symbolic matric into char
% To do: make an algorithm to put the Matrix in the right format "formatedA = f(txtA)"
fprintf(fileId, '%s', formatedA);
fclose(fileId);
If you test the code with fprintf(fileId, '%s', txtA);, you will see that the Matrix is not written like you want. It just needs an algorithm to put the matrix in the rigth format. Tell me, if you need help to do it.
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Kasper 2015 年 6 月 15 日
I'm not quite sure how to implement the algorithm Azzi's has posted into your code?

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### その他の回答 (2 件)

Azzi Abdelmalek 2015 年 6 月 12 日
for k=1:size(N,1)
str{k,1}=[ '''' char(N(k,1)) ' ' char(N(k,2)) ' ' char(N(k,3)) '''' ]
end
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Kasper 2015 年 6 月 15 日
Thanks to both of you! I'd wish I could give credit to both of you for answering my question.

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