%% home->Preferences->MatLabEditor/Debugger->fonts->18
clear
%% see file FirstStepMatLab.pdf + debugger (Select-> Evaluate Selection)
A=rand(6) % matrix create; representation
% end - the last element
column1=A(1:end,1) % column1=A(:,1); [column1,A(:,1)]; all(A(:,1)==column1)% other form
A(1:2:end)=0
spy(A) % dpends on number rows in matrix, show!
cat(1,column1,A(:,1)) % along rows [column1;A(:,1)] - ,; ~
ansmy=cat(2,column1,A(:,1)) % along columns [column1,A(:,1)]
%% matrix manipulation  !!! new section
help elmat
%% Constructors + Edition:
% zeros, ones, eye, diag, repmat, reshape
% fliplr, flipud, flip %for classes (Double, Interger, Char)
% triu, tril, blkdiag
%% Analytics (size, properties)
% size, ndims, length
% isequal, isempty, find
% isnan, isinf, isfinite, iszero
% isreal
%% special variables
eps, realmax, realmin,pi, i,j,inf,nan
true,false % 0,1
%% elementary functions
help elfun
% sind,tan, acos, 
% exp, log, log10,
% sqrt, abs, angle, cong, imag, real
% mod, rem, sign
%% Study Help, see. с.4 FirstStepMatLab.pdf
help ops
%% graphics
help graphics
 % plot
x=-pi:0.1:pi % x=x_0:step:x_end
y='exp(sin(x))*x'
subplot(1,2,1), y=vectorize(y), y=eval(y) % или eval(vectorize(y))
plot(x,y)
subplot(1,2,2),  y= exp(sin(x)).*x % или eval(vectorize(y))
plot(x,y,'r>-')

   
    % cylinder     - Generate cylinder.
    % sphere       - Generate sphere.
    % ellipsoid    - Generate ellipsoid.
    % patch        - Create patch
   [Xc,Yc,Zc]=cylinder(2,40)
   [Xs,Ys,Zs]=sphere(40)
   [Xe,Ye,Ze]=ellipsoid(0,0,0,2,7,15,30)