unable to show multiple graph while using semilogy in matlab

Question

I am trying to plot 3 graph within a single graph with x=1 to 10 and Y as power of 10 using semilogy but only one(the last one) graph is plotted and the remaining remains unploted.

semilogy(x,getval4(x,5),'-og');
semilogy(x,getval4(x,10),'--Xb');
semilogy(x,getval4(x,20),'--r');

Only semilogy(x,getval4(x,20),'--r');is plotted .I am new to mat lab so please sujjest me a way to plot all the three graphs.Also,I would like to have a grid too

[`hold`](http://www.mathworks.com/help/matlab/ref/hold.html) — sco1, Apr 29 '16 at 16:16

score 3 · Accepted Answer · answered Apr 29 '16 at 16:18

3

You need to do

semilogy(x,getval4(x,5),'-og');
hold on ;
semilogy(x,getval4(x,10),'--Xb');
semilogy(x,getval4(x,20),'--r');

(note the hold on after the first semilogy, not before)

answered Apr 29 '16 at 16:18

Shawn

593
4
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Awesome!..That worked..Cheers! – Abx Apr 29 '16 at 16:19
@Abx please mark the answer as correct – 16per9 Apr 29 '16 at 16:42

score 2 · Answer 2 · answered Apr 29 '16 at 16:31

2

Another option:

plot(x,getval4(x,5),'-og');
hold on ;
plot(x,getval4(x,10),'--Xb');
plot(x,getval4(x,20),'--r');
set(gca,'yscale','log')

answered Apr 29 '16 at 16:31

shamalaia

2,282
3
23
35

unable to show multiple graph while using semilogy in matlab

2 Answers2