For loop and adding elements to an array. How to?
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I have some function y(x). I would like to generate a list of y values for x between -10^-3 and 10^-3 in 10^-4 intervals and plot y vs x. I'm trying to do something simpler and less messy first for practice:
function test
global x
for n = -5; n < 5; n+1;
x(end+1)=2*n;
end
end
but this leaves me with x = -10. Why? What am I doing wrong and how could I fix it? Also, is there a way to make an array of x AND their corresponding y values simultaneously and then just plot that one thing? Like list = {{1,1},{2,4},{3,6},{4,8}} and plot this as pairs of coordinates.
5 个评论
per isakson
2015-5-21
Re   for n = -5; n < 5; n+1;   see help on for
per isakson
2015-5-21
"I guess for n=-5:1:5 works"   Did you try it?
Solarmew
2015-5-21
Walter Roberson
2015-5-21
Where did you find that help file?
采纳的回答
MATLAB is not C or any other low-level programming language that requires loops to solve everything. In MATLAB the standard method is to generate the whole vector at once using the colon operator:
>> x = -10^-3:10^-4:10^-3
x = -0.001 -0.0009 -0.0008 -0.0007 -0.0006 -0.0005 -0.0004 -0.0003 -0.0002 -0.0001 0 0.0001 0.0002 0.0003 0.0004 0.0005 0.0006 0.0007 0.0008 0.0009 0.001
This is faster and neater than using loops: knowing how to write vectorized code makes using MATLAB a lot faster, productive and enjoyable!
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