How to plot graph using data from a text file?

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bala balu
bala balu 2019-5-15
评论： Peter Arandorenko 2020-7-16
Attached is the sound.txt file and questions.
How do we plot a graph with said x and y values? i have tried this but to no success.
filename='sound.txt';
fid= fopen(filename,'r');
header = fscanf(fid,'%s',[1 1]);
headerx= fscanf(fid,'%f',[1 8]);
headery=[];
data=[];
for k= 1:24
headery= [headery; fscanf(fid,'%f',[1 1])];
data = [data; fscanf(fid,'%f',[1 8])];
end
mesh(headerx,headery,data)
Help please :)
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Star Strider
Star Strider 2019-5-16
‘Do you means using like X=[-10:5:25] when you meant saving it as a vector?’
Yes. Although you need to read it (and the y-vector) from the file.
‘And can you please clarify what you meant by saving the rest as a matrics? How do you accomplish that?’
The entire array will be imported as a matrix. For the rest, see the documentation section on Matrix Indexing (link).
bala balu
bala balu 2019-5-16
I have successfully completed my assignment. Thanks for all the help!

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KSSV
KSSV 2019-5-16
Replace y/x in the text file with NaN.
A = load('sound.txt') ;
x = A(1,2:end) ;
y = A(2:end,1) ;
Z = A(2:end,2:end) ;
figure
surf(x,y,Z)
figure
pcolor(x,y,Z)
figure
contour(x,y,Z)

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