save as txt file

when i use save function, matlab save text file but with out data

matlab make many symboles insteade of data

where is the error please?

the code as below

clc, clear all, close all

syms x %define the vairable of(x)

f(x)=-1.8*x^4+6.03*x^3+57.03*x^2-171.41*x+30.30;

figure(1); hold on;

fplot(f);

xL = xlim;

yL = ylim;

line(xL, [0 0],'color','k','linewidth',2) %x-axis

title('plot of Polynomial function');

xlabel('X-axis');

ylabel('Y-axis');

%Find roots by using built in symbolic command

disp('Matlab built in Symbolic command (roots function)')

d=[-1.8,6.03,57.03,-171.41,30.30] %vector of coefficients

sol1=roots(d) %solve by roots function

plot(sol1,'ko') %draw solution

% geeneration 50 equally spaced points between smallest and largest root

figure(2);hold on

format shortG

LR=max(sol1)

SM=min(sol1)

gp=linspace(SM,LR,50);

pp=f(gp);

rootsdata=[gp' pp'];

plot(gp,pp,'rx')

title('plot genration spacing');

xlabel('X-axis');

ylabel('Y-axis');

save('rootsdata.txt','rootsdata');

Answer 1

[Image Analyst]

Try the -ascii option. From the help:

p = rand(1,10);
q = ones(10);
save('pqfile.txt','p','q','-ascii')
type('pqfile.txt')

or try using fprintf() instead of save().

[Husam Aneed]

thank you its work but , matlab cant save second line

it give

Warning: Attempt to write an unsupported data type to an ASCII file.

Variable 'd2' not written to file.

gp=linspace(SM,LR,50);

pp=f(gp);

d1=gp';

d2=pp';

plot(gp,pp,'rx')

title('plot genration spacing');

xlabel('X-axis');

ylabel('Y-axis');

save('pqfile.txt','d1','d2','-ascii')

[Image Analyst]

Why do you want to use save? It's probably getting confused because it has no idea what format you want all these variables in. Therefore I recommend using fprintf() to write things out EXACTLY as you want them. Why does it have to be a text file anyway? What's wrong with just using the .mat format file?

[Husam Aneed]

because I have homework from my professor and he ask in it save the data to txt