Linear combination of a string vector (w/functions) and number vector (coefficients)

1
votes

I'm really new at matlab, and am trying to fit a line or curve to data points for homework (that part is actually done). Now, I want to take this a little further than the homework asked, I have constructed a function that takes in a text file with coordinates and any number of functions (1,x,x^2... e.g.) and determines the coefficients.

So in the end I'm left with two vectors: one with the coefficients: C = [a,b,c] and another one with functions: F = {'1','x','x^2'}, and I'd like to create a linear combination of them: l = a + b*x + c*x^2, to plot the curve on a graph, and for some reason I can't figure out how to get that to work. Is there something obvious I'm overlooking, or do I have to rethink this in some way?

1
matlab

1 Answers

0
votes
a=1; b=2; c=3;
C=[a,b,c];
CS = cellfun(@num2str,num2cell(C),'uniformoutput',0)
M={'*','*','*'};
F={'1','x','x^2'};
P={' + ',' + ',''};
S=reshape([CS; M; F; P],1,[]);
cat(2,S{:})

Output:

ans =

1*1 + 2*x + 3*x^2

Are you sure you want to print 'a', 'b' and 'c' as chars?