Strange issue encountered using textscan and cell arrays
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Peter Ryan
le 14 Oct 2016
Commenté : Star Strider
le 14 Oct 2016
When I run the following snippet of code:
str = '(3.3940269999999999,1,0) (0,3.3940269999999999,0) (0,0,2.024902)';
format = '(%f, %d, %d) (%d, %f, %d) (%d, %d, %f)';
A = textscan(str, format);
matrix = [A{1,1}, A{1,4}, A{1,7} ; A{1,2}, A{1,5}, A{1,8}; A{1,3}, A{1,6}, A{1,9}]
I get the following output matrix =
3 0 0
1 3 0
0 0 2
Why were the floating point numbers converted to integers?
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Star Strider
le 14 Oct 2016
When I run a slightly modified version of your code (because format is a function that defines the format displayed in the Command Window and Tooltips), I get:
format_string = '(%f, %d, %d) (%d, %f, %d) (%d, %d, %f)';
A = textscan(str, format_string);
matrix =
3×3 int32 matrix
3 0 0
1 3 0
0 0 2
That is likely because of the '%d' format descriptors. Convert them to '%f':
format_string = '(%f, %f, %f) (%f, %f, %f) (%f, %f, %f)';
to get:
matrix =
3.394 0 0
1 3.394 0
0 0 2.0249
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Eamon
le 14 Oct 2016
I think if you use the format function like below before the rest of your code, it will show the original floating point numbers.
format long
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