Piecewise function is not correct plotted with tikz
3
I am trying to plot a piecewise function using the code below. The problem is, that the right piece is not plotted correct. It should (obviously) be constant zero, for values bigger than pi/2, but it does not look like that in the plot.
I am sure I did something wrong.
Thanks in advance.
begin{tikzpicture}[
declare function={
func(x)= and(x >= -pi, x < -pi/2) * (0) +
and(x >= -pi/2, x <= pi/2) * (-(x)*(x)+pi*pi/4) +
and(x > pi/2, x <= pi) * * (0)
;
}
]
begin{axis}[
Axis Style,
xtick={
-3.14159, -1.5708, 0,
1.5708, 3.14159
},
xticklabels={
$-pi$, $-frac{pi}{2}$, $0$, $frac{pi}{2}$, $pi$
},
ytick={
0,
1.234, 2.467
},
yticklabels={
$0$, $frac{pi^2}{8}$, $frac{pi^2}{4}$
},
samples=75
]
addplot [mark=none,ultra thick, domain=-3.1415:3.15, blue] {func(x)};
end{axis}
end{tikzpicture}
tikz-pgf pgfplots
asked Jan 13 at 10:57
frankenappsfrankenapps
1184
|
show 2 more comments
3
I am trying to plot a piecewise function using the code below. The problem is, that the right piece is not plotted correct. It should (obviously) be constant zero, for values bigger than pi/2, but it does not look like that in the plot.
I am sure I did something wrong.
Thanks in advance.
begin{tikzpicture}[
declare function={
func(x)= and(x >= -pi, x < -pi/2) * (0) +
and(x >= -pi/2, x <= pi/2) * (-(x)*(x)+pi*pi/4) +
and(x > pi/2, x <= pi) * * (0)
;
}
]
begin{axis}[
Axis Style,
xtick={
-3.14159, -1.5708, 0,
1.5708, 3.14159
},
xticklabels={
$-pi$, $-frac{pi}{2}$, $0$, $frac{pi}{2}$, $pi$
},
ytick={
0,
1.234, 2.467
},
yticklabels={
$0$, $frac{pi^2}{8}$, $frac{pi^2}{4}$
},
samples=75
]
addplot [mark=none,ultra thick, domain=-3.1415:3.15, blue] {func(x)};
end{axis}
end{tikzpicture}
tikz-pgf pgfplots
asked Jan 13 at 10:57
frankenappsfrankenapps
1184
1
Welcome to TeX.SX! Without testing it I would guess that this is because of the number of samples and where they are. Removemark=noneto confirm this. Then you can either increase the number of samples by addingsamples=<number of samplesto either theaxisor theaddplotoptions or make sure that there is a sample point at all relevant places.
– Stefan Pinnow
Jan 13 at 11:01
I have already tried increasing/decreasing the number of samples, it sometimes got better, but a higher number of samples did not mean a better result...
– frankenapps
Jan 13 at 11:03
1
I haven't tested but I think that removing a*in the third line indeclare functionwould do.
– JouleV
Jan 13 at 11:04
1
Both of the first two lines have one*each, but the third one has two*s. Maybe that is the problem.
– JouleV
Jan 13 at 11:05
1
Ah, thanks a lot. I wonder how I could not have noticed that..
– frankenapps
Jan 13 at 11:06
|
show 2 more comments
3
3
3
I am trying to plot a piecewise function using the code below. The problem is, that the right piece is not plotted correct. It should (obviously) be constant zero, for values bigger than pi/2, but it does not look like that in the plot.
I am sure I did something wrong.
Thanks in advance.
begin{tikzpicture}[
declare function={
func(x)= and(x >= -pi, x < -pi/2) * (0) +
and(x >= -pi/2, x <= pi/2) * (-(x)*(x)+pi*pi/4) +
and(x > pi/2, x <= pi) * * (0)
;
}
]
begin{axis}[
Axis Style,
xtick={
-3.14159, -1.5708, 0,
1.5708, 3.14159
},
xticklabels={
$-pi$, $-frac{pi}{2}$, $0$, $frac{pi}{2}$, $pi$
},
ytick={
0,
1.234, 2.467
},
yticklabels={
$0$, $frac{pi^2}{8}$, $frac{pi^2}{4}$
},
samples=75
]
addplot [mark=none,ultra thick, domain=-3.1415:3.15, blue] {func(x)};
end{axis}
end{tikzpicture}
tikz-pgf pgfplots
asked Jan 13 at 10:57
frankenappsfrankenapps
1184
I am trying to plot a piecewise function using the code below. The problem is, that the right piece is not plotted correct. It should (obviously) be constant zero, for values bigger than pi/2, but it does not look like that in the plot.
I am sure I did something wrong.
Thanks in advance.
begin{tikzpicture}[
declare function={
func(x)= and(x >= -pi, x < -pi/2) * (0) +
and(x >= -pi/2, x <= pi/2) * (-(x)*(x)+pi*pi/4) +
and(x > pi/2, x <= pi) * * (0)
;
}
]
begin{axis}[
Axis Style,
xtick={
-3.14159, -1.5708, 0,
1.5708, 3.14159
},
xticklabels={
$-pi$, $-frac{pi}{2}$, $0$, $frac{pi}{2}$, $pi$
},
ytick={
0,
1.234, 2.467
},
yticklabels={
$0$, $frac{pi^2}{8}$, $frac{pi^2}{4}$
},
samples=75
]
addplot [mark=none,ultra thick, domain=-3.1415:3.15, blue] {func(x)};
end{axis}
end{tikzpicture}
tikz-pgf pgfplots
tikz-pgf pgfplots
asked Jan 13 at 10:57
frankenappsfrankenapps
1184
asked Jan 13 at 10:57
frankenappsfrankenapps
1184
asked Jan 13 at 10:57
frankenappsfrankenapps
1184
asked Jan 13 at 10:57
frankenappsfrankenapps
1184
asked Jan 13 at 10:57
frankenappsfrankenapps
1184
1184
1
Welcome to TeX.SX! Without testing it I would guess that this is because of the number of samples and where they are. Removemark=noneto confirm this. Then you can either increase the number of samples by addingsamples=<number of samplesto either theaxisor theaddplotoptions or make sure that there is a sample point at all relevant places.
– Stefan Pinnow
Jan 13 at 11:01
I have already tried increasing/decreasing the number of samples, it sometimes got better, but a higher number of samples did not mean a better result...
– frankenapps
Jan 13 at 11:03
1
I haven't tested but I think that removing a*in the third line indeclare functionwould do.
– JouleV
Jan 13 at 11:04
1
Both of the first two lines have one*each, but the third one has two*s. Maybe that is the problem.
– JouleV
Jan 13 at 11:05
1
Ah, thanks a lot. I wonder how I could not have noticed that..
– frankenapps
Jan 13 at 11:06
|
show 2 more comments
1
Welcome to TeX.SX! Without testing it I would guess that this is because of the number of samples and where they are. Removemark=noneto confirm this. Then you can either increase the number of samples by addingsamples=<number of samplesto either theaxisor theaddplotoptions or make sure that there is a sample point at all relevant places.
– Stefan Pinnow
Jan 13 at 11:01
I have already tried increasing/decreasing the number of samples, it sometimes got better, but a higher number of samples did not mean a better result...
– frankenapps
Jan 13 at 11:03
1
I haven't tested but I think that removing a*in the third line indeclare functionwould do.
– JouleV
Jan 13 at 11:04
1
Both of the first two lines have one*each, but the third one has two*s. Maybe that is the problem.
– JouleV
Jan 13 at 11:05
1
Ah, thanks a lot. I wonder how I could not have noticed that..
– frankenapps
Jan 13 at 11:06
1
1
Welcome to TeX.SX! Without testing it I would guess that this is because of the number of samples and where they are. Remove
mark=none to confirm this. Then you can either increase the number of samples by adding samples=<number of samples to either the axis or the addplot options or make sure that there is a sample point at all relevant places.– Stefan Pinnow
Jan 13 at 11:01
Welcome to TeX.SX! Without testing it I would guess that this is because of the number of samples and where they are. Remove
mark=none to confirm this. Then you can either increase the number of samples by adding samples=<number of samples to either the axis or the addplot options or make sure that there is a sample point at all relevant places.– Stefan Pinnow
Jan 13 at 11:01
I have already tried increasing/decreasing the number of samples, it sometimes got better, but a higher number of samples did not mean a better result...
– frankenapps
Jan 13 at 11:03
I have already tried increasing/decreasing the number of samples, it sometimes got better, but a higher number of samples did not mean a better result...
– frankenapps
Jan 13 at 11:03
1
1
I haven't tested but I think that removing a
* in the third line in declare function would do.– JouleV
Jan 13 at 11:04
I haven't tested but I think that removing a
* in the third line in declare function would do.– JouleV
Jan 13 at 11:04
1
1
Both of the first two lines have one
* each, but the third one has two *s. Maybe that is the problem.– JouleV
Jan 13 at 11:05
Both of the first two lines have one
* each, but the third one has two *s. Maybe that is the problem.– JouleV
Jan 13 at 11:05
1
1
Ah, thanks a lot. I wonder how I could not have noticed that..
– frankenapps
Jan 13 at 11:06
Ah, thanks a lot. I wonder how I could not have noticed that..
– frankenapps
Jan 13 at 11:06
|
show 2 more comments
1 Answer
1
active
oldest
votes
2
There was a small mistake in your code.
Try with this small change:
documentclass{article}
usepackage{tikz,pgfplots}
begin{document}
begin{tikzpicture}[
declare function={
func(x)= and(x >= -pi, x < -pi/2) * (0) +
and(x >= -pi/2, x <= pi/2) * (-(x)*(x)+pi*pi/4) +
and(x > pi/2, x <= pi) * (0)
;
}
]
begin{axis}[
Axis Style,
xtick={
-3.14159, -1.5708, 0,
1.5708, 3.14159
},
xticklabels={
$-pi$, $-frac{pi}{2}$, $0$, $frac{pi}{2}$, $pi$
},
ytick={
0,
1.234, 2.467
},
yticklabels={
$0$, $frac{pi^2}{8}$, $frac{pi^2}{4}$
},
samples=75
]
addplot [mark=none,ultra thick, domain=-3.1415:3.15, blue] {func(x)};
end{axis}
end{tikzpicture}
end{document}
answered Jan 13 at 11:17
Mi Ka ElMi Ka El
917
2
Axis Style,is not defined ...
– Zarko
Jan 13 at 14:27
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
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oldest
votes
active
oldest
votes
2
There was a small mistake in your code.
Try with this small change:
documentclass{article}
usepackage{tikz,pgfplots}
begin{document}
begin{tikzpicture}[
declare function={
func(x)= and(x >= -pi, x < -pi/2) * (0) +
and(x >= -pi/2, x <= pi/2) * (-(x)*(x)+pi*pi/4) +
and(x > pi/2, x <= pi) * (0)
;
}
]
begin{axis}[
Axis Style,
xtick={
-3.14159, -1.5708, 0,
1.5708, 3.14159
},
xticklabels={
$-pi$, $-frac{pi}{2}$, $0$, $frac{pi}{2}$, $pi$
},
ytick={
0,
1.234, 2.467
},
yticklabels={
$0$, $frac{pi^2}{8}$, $frac{pi^2}{4}$
},
samples=75
]
addplot [mark=none,ultra thick, domain=-3.1415:3.15, blue] {func(x)};
end{axis}
end{tikzpicture}
end{document}
answered Jan 13 at 11:17
Mi Ka ElMi Ka El
917
2
Axis Style,is not defined ...
– Zarko
Jan 13 at 14:27
add a comment |
2
There was a small mistake in your code.
Try with this small change:
documentclass{article}
usepackage{tikz,pgfplots}
begin{document}
begin{tikzpicture}[
declare function={
func(x)= and(x >= -pi, x < -pi/2) * (0) +
and(x >= -pi/2, x <= pi/2) * (-(x)*(x)+pi*pi/4) +
and(x > pi/2, x <= pi) * (0)
;
}
]
begin{axis}[
Axis Style,
xtick={
-3.14159, -1.5708, 0,
1.5708, 3.14159
},
xticklabels={
$-pi$, $-frac{pi}{2}$, $0$, $frac{pi}{2}$, $pi$
},
ytick={
0,
1.234, 2.467
},
yticklabels={
$0$, $frac{pi^2}{8}$, $frac{pi^2}{4}$
},
samples=75
]
addplot [mark=none,ultra thick, domain=-3.1415:3.15, blue] {func(x)};
end{axis}
end{tikzpicture}
end{document}
answered Jan 13 at 11:17
Mi Ka ElMi Ka El
917
2
Axis Style,is not defined ...
– Zarko
Jan 13 at 14:27
add a comment |
2
2
2
There was a small mistake in your code.
Try with this small change:
documentclass{article}
usepackage{tikz,pgfplots}
begin{document}
begin{tikzpicture}[
declare function={
func(x)= and(x >= -pi, x < -pi/2) * (0) +
and(x >= -pi/2, x <= pi/2) * (-(x)*(x)+pi*pi/4) +
and(x > pi/2, x <= pi) * (0)
;
}
]
begin{axis}[
Axis Style,
xtick={
-3.14159, -1.5708, 0,
1.5708, 3.14159
},
xticklabels={
$-pi$, $-frac{pi}{2}$, $0$, $frac{pi}{2}$, $pi$
},
ytick={
0,
1.234, 2.467
},
yticklabels={
$0$, $frac{pi^2}{8}$, $frac{pi^2}{4}$
},
samples=75
]
addplot [mark=none,ultra thick, domain=-3.1415:3.15, blue] {func(x)};
end{axis}
end{tikzpicture}
end{document}
answered Jan 13 at 11:17
Mi Ka ElMi Ka El
917
There was a small mistake in your code.
Try with this small change:
documentclass{article}
usepackage{tikz,pgfplots}
begin{document}
begin{tikzpicture}[
declare function={
func(x)= and(x >= -pi, x < -pi/2) * (0) +
and(x >= -pi/2, x <= pi/2) * (-(x)*(x)+pi*pi/4) +
and(x > pi/2, x <= pi) * (0)
;
}
]
begin{axis}[
Axis Style,
xtick={
-3.14159, -1.5708, 0,
1.5708, 3.14159
},
xticklabels={
$-pi$, $-frac{pi}{2}$, $0$, $frac{pi}{2}$, $pi$
},
ytick={
0,
1.234, 2.467
},
yticklabels={
$0$, $frac{pi^2}{8}$, $frac{pi^2}{4}$
},
samples=75
]
addplot [mark=none,ultra thick, domain=-3.1415:3.15, blue] {func(x)};
end{axis}
end{tikzpicture}
end{document}
answered Jan 13 at 11:17
Mi Ka ElMi Ka El
917
answered Jan 13 at 11:17
Mi Ka ElMi Ka El
917
answered Jan 13 at 11:17
Mi Ka ElMi Ka El
917
answered Jan 13 at 11:17
Mi Ka ElMi Ka El
917
917
2
Axis Style,is not defined ...
– Zarko
Jan 13 at 14:27
add a comment |
2
Axis Style,is not defined ...
– Zarko
Jan 13 at 14:27
2
2
Axis Style, is not defined ...– Zarko
Jan 13 at 14:27
Axis Style, is not defined ...– Zarko
Jan 13 at 14:27
add a comment |
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1
Welcome to TeX.SX! Without testing it I would guess that this is because of the number of samples and where they are. Remove
mark=noneto confirm this. Then you can either increase the number of samples by addingsamples=<number of samplesto either theaxisor theaddplotoptions or make sure that there is a sample point at all relevant places.– Stefan Pinnow
Jan 13 at 11:01
I have already tried increasing/decreasing the number of samples, it sometimes got better, but a higher number of samples did not mean a better result...
– frankenapps
Jan 13 at 11:03
1
I haven't tested but I think that removing a
*in the third line indeclare functionwould do.– JouleV
Jan 13 at 11:04
1
Both of the first two lines have one
*each, but the third one has two*s. Maybe that is the problem.– JouleV
Jan 13 at 11:05
1
Ah, thanks a lot. I wonder how I could not have noticed that..
– frankenapps
Jan 13 at 11:06