String handling questions
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I have 2 questions regarding about strings and I would like to get help. 1. How to handle the " ' " in Matlab? - The syntax set_param function is set_param('Model_Name/Block_Name', 'Value', 'data') and I would like to set multiple Block_Name's Value (Block_Name is named as K(i), where i = 1 to N - I tried set_param('Model_Name/K(' & num2str(i) & ')', 'Value', 'data') and set_param('Model_Name/K(' num2str(i) ')', 'Value', 'data') but both failed
2. I have a list of string like [1.21321421412421512312312521131232] and try to convert in to number using num2str() can only convert certain digit, I tried with format long and format longeng but they still cannot handle all of the digits. Is there anyway to handle this?
回答（2 个）
Paulo Silva
2011-4-16
set_param(['Model_Name/K(' num2str(i) ')'], 'Value', 'data')
2 个评论
Raymond Le
2011-4-16
Walter Roberson
2011-4-16
set_param(['Model_Name/K(' num2str(i) ')'], 'Value', num2str(a(i+1)) )
Or you might find you prefer the style
set_param( sprintf('Model_Name/K(%d)', i), 'Value', sprintf('%d', a(i+1)) )
Walter Roberson
2011-4-16
The closest you can get to
1.21321421412421512312312521131232
in MATLAB is
1.21321421412421504015810569399036467075347900390625
which is accurate to within
0.0000000000000002220446049250313080847263336181640625
In order to represent 1.21321421412421512312312521131232 more accurately, you need to use the Symbolic Toolbox,
digits(35);
A = sym('1.21321421412421512312312521131232');
However, to use the number meaningfully you would pretty much need to convert the rest of your numbers to symbolic as well as otherwise intermediate calculations might not retain enough accuracy.
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2011-4-16
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