How to print symbolic representation of [4^1+1 4^2+1 4^3+1] rather than the actual numerical output?

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hmhuang
hmhuang 2020-5-17
评论： Ameer Hamza 2020-5-18
I would like to add a line of texts like "points = 4^1+1 4^2+1 4^3+1" instead of "points = 5 17 65" to chart.
The current content of my code to print "points = 5 17 65" is as following:
for i = 1:3
n = 4^i + 1;
%{
do something with numeric values of n and i (i.e., i = 1, 2, 3)
%}
% Storing "number of points" in vector 'point'
point(i) = n;
end
disp(['Grid points = ' sprintf('%d ', point)])
Note that I do need the numerical values of n and i (i.e., i = 1, 2, 3 for n = 4^i + 1) to do some computations.
I found
syms i
may be appropriate for my intended use, but cannot figure out how to exactly apply it into my for-loop.
Please help me to figure out, any suggestions will be very appreciated!
Thanks!

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Ameer Hamza
Ameer Hamza 2020-5-17
编辑：Ameer Hamza 2020-5-17
point = 1:3;
disp(['Grid points = ' sprintf('4^%d ', point)])
Result
Grid points = 4^1 4^2 4^3
  2 个评论
hmhuang
hmhuang 2020-5-18
Thanks for your solution! Very intuitive!
But If I want add the text "Grid points = 4^1 4^2 4^3" to a chart by using:
for i = 1:3
n = 4^i + 1;
%{
do something with numeric values of n and i (i.e., i = 1, 2, 3)
%}
% Storing "number of points" in vector 'point'
point(i) = sprintf("4^%d", i);
end
txt = { "Resolution",
["Grid points = " point] };
text(xlim(1)*2, ylim(2)*0.01, txt, 'FontSize', 16);
An error happened due to the misuse of cell array:
Error using text
Cell array can contain only non-empty character vectors, string vectors, or numbers.
How can I resolve this problem?
Thank you
Ameer Hamza
Ameer Hamza 2020-5-18
The syntax is not correct, according to MATLAB. But I didn't understand what you are trying to do here. Can you explain with an image what where you want to write the text()?

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