what is the best mode to populate this array in this loop annidate?

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pipor
pipor 2023-9-11
评论： pipor 2023-9-11
Ran in:
i want to code it to creare text for legend plot! (legend)
it's better to use string and strcat or use arraycell ?
if the better is the second how can i do it?
or is it better to create the text outside the nested loop?
str1="a";
wA=1;
str2="b";
wB=1;
n=5;
b=2;
valA=rand(n,1,1) %it's only for example..i don't use it :)
valA = 5×1
0.4488 0.3232 0.4840 0.9989 0.2870
valB=rand(b,1,1)
valB = 2×1
0.3478 0.2064
clear str
count=0;
strtot="";
for i=1:n
for k=1:b
count=count+1;
if wA==1
strtot=strcat(str1,"-",num2str(valA(i)))
end
if wB==1
strtot=strcat(strtot," ** ",str2,"-",num2str(valB(k)))
end
strArr(count,:)=strtot;
end
end
strtot = "a-0.44885"
strtot = "a-0.44885 ** b-0.34784"
strtot = "a-0.44885"
strtot = "a-0.44885 ** b-0.20644"
strtot = "a-0.32321"
strtot = "a-0.32321 ** b-0.34784"
strtot = "a-0.32321"
strtot = "a-0.32321 ** b-0.20644"
strtot = "a-0.48396"
strtot = "a-0.48396 ** b-0.34784"
strtot = "a-0.48396"
strtot = "a-0.48396 ** b-0.20644"
strtot = "a-0.99888"
strtot = "a-0.99888 ** b-0.34784"
strtot = "a-0.99888"
strtot = "a-0.99888 ** b-0.20644"
strtot = "a-0.28696"
strtot = "a-0.28696 ** b-0.34784"
strtot = "a-0.28696"
strtot = "a-0.28696 ** b-0.20644"

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回答（1 个）

Dyuman Joshi
Dyuman Joshi 2023-9-11
Ran in:
It would be better to use string instead of cells as they take less memory and easier to work with -
n=5;
b=2;
valA=rand(n,1,1) %it's only for example..i don't use it :)
valA = 5×1
0.1930 0.5700 0.8833 0.6422 0.7329
valB=rand(b,1,1)
valB = 2×1
0.6020 0.5495
[A,B] = meshgrid(valA,valB);
"a-" + string(A(:)) + " ** b-" + string(B(:))
ans = 10×1 string array
"a-0.19302 ** b-0.60203" "a-0.19302 ** b-0.54955" "a-0.56996 ** b-0.60203" "a-0.56996 ** b-0.54955" "a-0.88331 ** b-0.60203" "a-0.88331 ** b-0.54955" "a-0.64219 ** b-0.60203" "a-0.64219 ** b-0.54955" "a-0.73285 ** b-0.60203" "a-0.73285 ** b-0.54955"
  3 个评论
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Dyuman Joshi
Dyuman Joshi 2023-9-11
编辑：Dyuman Joshi 2023-9-11
I am well aware that your code is different and that you have used wA and wB in your code inside the for loop, but I was giving a general example.
You can always modify the code according to requirement.
Let's consider that the input are -
A = [2 3 5 7];
B = [1 4 6 8];
What should be the output if
1 - wA is zero and wB is one?
2 - wA is one and wB is zero?
3 - wA is one and wB is one?
pipor
pipor 2023-9-11
yes...it can be like your example but I solved it as a post I wrote.. Thanks anyway for the help

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