expand array within for loop

Question

Josefina Ottitsch 2019-4-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/454232-expand-array-within-for-loop

评论： Walter Roberson 2019-4-3

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

hello,

I have this code:

close all
x=[0,1,2,3,4,5]
x1=sin(x)
p1=x1(2)
p2=x1(3)
x3=cos(x)
p4=x3(2)
p5=x3(3)
figure(1)
plot(x1)
hold all
plot([2],[p1],'o')
plot([3],[p2],'o')
plot(x3)
plot([2],[p4],'o')
plot([3],[p5],'o')
k=2
    for k=1:k
        ls1=[num2str(k),'.Q']
        ls2=[num2str(k),'.SR']
        ls3=[num2str(k),'.r']            
    end
legend(ls1,ls2,ls3)

and I would like to fix the legend. I want my program to tell me that the 6 legend variables are: 1.Q,1.SR,1.r,2.Q,2.SR,2.r

Right now the program is overwriting the outcome of the for loop.

How do I do this?

Thank sou yo much!

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Answer 1

Walter Roberson 2019-4-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/454232-expand-array-within-for-loop#answer_368919

在 MATLAB Online 中打开

legend( [1 2] + [".Q"; ".SR"; ".r"] )

Requires R2017a or later.

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Josefina Ottitsch 2019-4-3

thank you so much!

Walter Roberson 2019-4-3

Note that for this purpose it was important that the first part [1 2] be a row vector and the second part [".Q"; ".SR"; ".r"] be a column vector, and that R2016b or later were used, as "implicit expansion" is used here to get all combinations of the two. The restriction to R2017a or later is because the string object syntax "" was introduced in R2017a. There is a way to extend the use of string objects to R2016b as well. String objects did not exist before R2016b, so for earlier releases a different approach would have to be used.

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