Basic function in MATLAB -

i starting work matlab , still don't know how lot of things. have create simple plot function, let's supose is:

f(x)=3x+1, defined example -5 < x < 5 

what need create function transforms independent variable (it's input parameter). example, if function named plotfunction, if execute command plotfunction(2x+3) final plotted graphic function:

f(x)=6x+10 

functions can defined function environment. want function has no output variable, plot apparently.

function [] = plotfunction(f,minrange,maxrange)     range = minrange:0.01:maxrange; % create plot range, change 0.01 w/e precision want attain     figure; % create figure     plotfunc = 3.*f(range)+1; % function     plot(range,plotfunc) end 

there's 2 things need know when trying use other functions 'base function': have set take steps of 0.01 might need set smaller (e.g. when plotting on [-1e-4,1e-4]). can hand or use precision switch @efirvida used. other thing: call 3*f(range)+1 plotfunc. if want use other functions, there, e.g. if want use cos(x)+1/3*sin(pi*x)*e^(-x)) set x f(x): plotfunc = cos(f(x))+1/3.*sin(pi.*f(x))*exp(-f(x)))

now have take care call x function handle, so: f = @(x)(2*x+3). @ makes function handle, argument directly behind defines variable in defined function, here that's (x). second set of brackets contains actual function. define range, i.e. minrange = -5 maxrange = 5 , call function:

plotfunction(f,minrange,maxrange) 

resulting in: