# Plotting error ("hold all-plots")
**URL:** https://discourse.julialang.org/t/plotting-error-hold-all-plots/19580
**Category:** General Usage
**Tags:** plotting
**Created:** [January 13, 2019, 1:38am UTC](https://discourse.julialang.org/t/plotting-error-hold-all-plots/19580 "2019-01-13T01:38:52Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@Aquaman](https://discourse.julialang.org/u/Aquaman)
#### Post date: [January 13, 2019, 1:38am UTC](https://discourse.julialang.org/t/plotting-error-hold-all-plots/19580/1 "2019-01-13T01:38:52Z")
Dear All,
now I am plotting some figures (simple) usig Julia, but It seems not working, i think “hold on” could be the reason??
function Bernstein(n,i,t)
Brnbasis=factorial(BigInt(n))/factorial(BigInt(i))/factorial(BigInt(n-i)) _(1/2+t/2)^i_(1/2-t/2)^(n-i)
return(Brnbasis)
end
using PyPlot
#using Plots
#pyplot()
n=2 # 2nd/4th order of polynomial
dt=1/50
t=-1:dt:1
y=zeros(size(t))
for i=0:n
for dt=1:size(t,2)
y(dt)=Bernstein(n,i,t(dt))
end
plot(t,y, reuse=false)
end
#xlabel(“X’); ylabel('Y”)
---
### Author:  [@tomaklutfu](https://discourse.julialang.org/u/tomaklutfu)
#### Post date: [January 13, 2019, 5:37am UTC](https://discourse.julialang.org/t/plotting-error-hold-all-plots/19580/2 "2019-01-13T05:37:35Z")
The `y(dt) = ...` is function declaration syntax in julia, instead use `y[dt] = ...`. I am not familiar with `PyPlot` but usually if you want `hold on` MATLAB behaviour , you can use `plot!(...)` for later plots after first plot in julia plot libraries.
---
### Author:  [@Aquaman](https://discourse.julialang.org/u/Aquaman)
#### Post date: [January 13, 2019, 6:41am UTC](https://discourse.julialang.org/t/plotting-error-hold-all-plots/19580/3 "2019-01-13T06:41:16Z")
Thanks!
I have changed the codes (plot!) as the following:
function Bernstein(n,i,t)
Brnbasis=factorial(BigInt(n))/factorial(BigInt(i))/factorial(BigInt(n-i)) _(1/2+t/2)^i_ (1/2-t/2)^(n-i)
return(Brnbasis)
end
#using PyPlot
using Plots
pyplot()
n=2 # 2nd/4th order of polynomial
dt=1/50
t=-1:dt:1
y=zeros(size(t))
for i=0:n
for dt=1:size(t,1)
y[dt]=Bernstein(n,i,t[dt])
end
plot!(t,y)
end
#xlabel(“X’); ylabel('Y”)
But it shows no result…
---
### Author:  [@dpsanders](https://discourse.julialang.org/u/dpsanders)
#### Post date: [January 13, 2019, 7:41am UTC](https://discourse.julialang.org/t/plotting-error-hold-all-plots/19580/4 "2019-01-13T07:41:55Z")
A for loop does not return a result.
Add plot!() at the end to see the plot.
---
### Author:  [@Aquaman](https://discourse.julialang.org/u/Aquaman)
#### Post date: [January 13, 2019, 8:05am UTC](https://discourse.julialang.org/t/plotting-error-hold-all-plots/19580/5 "2019-01-13T08:05:48Z")
it shows me one curve in Julia, the correct results are three curves in MATLAB.
In MATLAB is
plot(t,y,‘LineWidth’,2);
hold all;
---
### Author:  [@Aquaman](https://discourse.julialang.org/u/Aquaman)
#### Post date: [January 13, 2019, 8:06am UTC](https://discourse.julialang.org/t/plotting-error-hold-all-plots/19580/6 "2019-01-13T08:06:55Z")
In addition, why size(t,1) in Julia is equal to :size(t,2) in MATLAB??
---
### Author:  [@mkborregaard](https://discourse.julialang.org/u/mkborregaard)
#### Post date: [January 13, 2019, 11:26am UTC](https://discourse.julialang.org/t/plotting-error-hold-all-plots/19580/7 "2019-01-13T11:26:00Z")
Because Julia is column-major.
---
### Author:  [@Aquaman](https://discourse.julialang.org/u/Aquaman)
#### Post date: [January 13, 2019, 11:28am UTC](https://discourse.julialang.org/t/plotting-error-hold-all-plots/19580/8 "2019-01-13T11:28:35Z")
Okay, If I use two times “plot!()”, it shows me correct results, thanks!
---
### Author:  [@Seif\_Shebl](https://discourse.julialang.org/u/Seif_Shebl)
#### Post date: [January 13, 2019, 11:31am UTC](https://discourse.julialang.org/t/plotting-error-hold-all-plots/19580/9 "2019-01-13T11:31:11Z")
In Julia, PyPlot will `hold on` automatically. Just use the correct syntax for indexing and function call.
```julia
function Bernstein(n,i,t)
Brnbasis=factorial(BigInt(n))/factorial(BigInt(i))/factorial(BigInt(n-i)) #(1/2+t/2)^i(1/2-t/2)^(n-i)
return(Brnbasis)
end
using PyPlot
n = 2 # 2nd/4th order of polynomial
dt = 1/50
t = -1:dt:1
y = zeros(size(t))
for i = 0:n
for dt = 1:size(t,2)
y[dt] = Bernstein(n,i,t[dt])
end
plot(t,y)
end
xlabel("X"); ylabel("Y")
```
---
### Author:  [@Aquaman](https://discourse.julialang.org/u/Aquaman)
#### Post date: [January 13, 2019, 11:38am UTC](https://discourse.julialang.org/t/plotting-error-hold-all-plots/19580/10 "2019-01-13T11:38:30Z")
this method also works, thanks!