# Plotting error, grid\_b **URL:** \ **Category:** Python usage\ **Created:** [May 24, 2023, 3:47pm UTC](https://openturns.discourse.group/t/plotting-error-grid-b/291 "2023-05-24T15:47:35Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![PhilippIce](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/philippice/32/263_2.png) [@PhilippIce](https://openturns.discourse.group/u/PhilippIce)\ **Post date:** [May 24, 2023, 3:47pm UTC](https://openturns.discourse.group/t/plotting-error-grid-b/291/1 "2023-05-24T15:47:35Z")
Hey Everybody, Thanks for the awesome software. I seem to be running into a bug with incompatible versions of the software. I am running openturns version 1.20.post3 and matplotlib 3.7.1. When I am trying to plot something with viewer, there seems to be a bug. Here is a small mwe ```python import openturns as ot import openturns.viewer as viewer sampleSize=10 g = ot.SymbolicFunction(["x"], ["0.5*x^2 + sin(2.5*x)"]) xMin = -0.9 xMax = 1.9 X_distr = ot.Uniform(xMin, xMax) X = ot.LHSExperiment(X_distr, sampleSize, False, False).generate() Y = g(X) graph = g.draw(xMin, xMax) view = viewer.View(graph) ``` This produces the following errror: ```auto NameError Traceback (most recent call last) Cell In[9], line 7 5 xMax = 1.9 6 X_distr = ot.Uniform(xMin, xMax) ----> 7 X = ot.LHSExperiment(X_distr, sampleSize, False, False).generate() 8 Y = g(X) 10 graph = g.draw(xMin, xMax) NameError: name 'sampleSize' is not defined In [10]: ...: ...: import openturns as ot ...: import openturns.viewer as viewer ...: sampleSize=10 ...: g = ot.SymbolicFunction(["x"], ["0.5*x^2 + sin(2.5*x)"]) ...: xMin = -0.9 ...: xMax = 1.9 ...: X_distr = ot.Uniform(xMin, xMax) ...: X = ot.LHSExperiment(X_distr, sampleSize, False, False).generate() ...: Y = g(X) ...: ...: graph = g.draw(xMin, xMax) ...: view = viewer.View(graph) ...: --------------------------------------------------------------------------- ValueError Traceback (most recent call last) Cell In[10], line 12 9 Y = g(X) 11 graph = g.draw(xMin, xMax) ---> 12 view = viewer.View(graph) File ~/miniconda3/envs/kriging3/lib/python3.11/site-packages/openturns/viewer.py:299, in View. __init__ (self, graph, pixelsize, figure, figure_kw, axes, plot_kw, axes_kw, bar_kw, pie_kw, polygon_kw, polygoncollection_kw, contour_kw, step_kw, clabel_kw, text_kw, legend_kw, add_legend, square_axes, **kwargs) 294 if (graph.getLogScale() == ot.GraphImplementation.LOGY) or ( 295 graph.getLogScale() == ot.GraphImplementation.LOGXY 296 ): 297 self._ax[0].set_yscale("log") --> 299 self._ax[0].grid(b=graph.getGrid()) 301 # use scientific notation on non-log axis 302 axis_mask = { 303 ot.GraphImplementation.NONE: "both", 304 ot.GraphImplementation.LOGX: "y", 305 ot.GraphImplementation.LOGY: "x", 306 ot.GraphImplementation.LOGXY: None, 307 } File ~/miniconda3/envs/kriging3/lib/python3.11/site-packages/matplotlib/axes/_base.py:3194, in _AxesBase.grid(self, visible, which, axis, **kwargs) 3192 _api.check_in_list(['x', 'y', 'both'], axis=axis) 3193 if axis in ['x', 'both']: -> 3194 self.xaxis.grid(visible, which=which, **kwargs) 3195 if axis in ['y', 'both']: 3196 self.yaxis.grid(visible, which=which, **kwargs) File ~/miniconda3/envs/kriging3/lib/python3.11/site-packages/matplotlib/axis.py:1660, in Axis.grid(self, visible, which, **kwargs) 1657 if which in ['major', 'both']: 1658 gridkw['gridOn'] = (not self._major_tick_kw['gridOn'] 1659 if visible is None else visible) -> 1660 self.set_tick_params(which='major', **gridkw) 1661 self.stale = True File ~/miniconda3/envs/kriging3/lib/python3.11/site-packages/matplotlib/axis.py:932, in Axis.set_tick_params(self, which, reset, **kwargs) 919 """ 920 Set appearance parameters for ticks, ticklabels, and gridlines. 921 (...) 929 gridlines. 930 """ 931 _api.check_in_list(['major', 'minor', 'both'], which=which) --> 932 kwtrans = self._translate_tick_params(kwargs) 934 # the kwargs are stored in self._major/minor_tick_kw so that any 935 # future new ticks will automatically get them 936 if reset: File ~/miniconda3/envs/kriging3/lib/python3.11/site-packages/matplotlib/axis.py:1076, in Axis._translate_tick_params(kw, reverse) 1074 for key in kw_: 1075 if key not in allowed_keys: -> 1076 raise ValueError( 1077 "keyword %s is not recognized; valid keywords are %s" 1078 % (key, allowed_keys)) 1079 kwtrans.update(kw_) 1080 return kwtrans ValueError: keyword grid_b is not recognized; valid keywords are ['size', 'width', 'color', 'tickdir', 'pad', 'labelsize', 'labelcolor', 'zorder', 'gridOn', 'tick1On', 'tick2On', 'label1On', 'label2On', 'length', 'direction', 'left', 'bottom', 'right', 'top', 'labelleft', 'labelbottom', 'labelright', 'labeltop', 'labelrotation', 'grid_agg_filter', 'grid_alpha', 'grid_animated', 'grid_antialiased', 'grid_clip_box', 'grid_clip_on', 'grid_clip_path', 'grid_color', 'grid_dash_capstyle', 'grid_dash_joinstyle', 'grid_dashes', 'grid_data', 'grid_drawstyle', 'grid_figure', 'grid_fillstyle', 'grid_gapcolor', 'grid_gid', 'grid_in_layout', 'grid_label', 'grid_linestyle', 'grid_linewidth', 'grid_marker', 'grid_markeredgecolor', 'grid_markeredgewidth', 'grid_markerfacecolor', 'grid_markerfacecoloralt', 'grid_markersize', 'grid_markevery', 'grid_mouseover', 'grid_path_effects', 'grid_picker', 'grid_pickradius', 'grid_rasterized', 'grid_sketch_params', 'grid_snap', 'grid_solid_capstyle', 'grid_solid_joinstyle', 'grid_transform', 'grid_url', 'grid_visible', 'grid_xdata', 'grid_ydata', 'grid_zorder', 'grid_aa', 'grid_c', 'grid_ds', 'grid_ls', 'grid_lw', 'grid_mec', 'grid_mew', 'grid_mfc', 'grid_mfcalt', 'grid_ms'] ``` Does someone have an idea how I can fix that? Thanks for your help! Philipp ---
**Author:** ![regislebrun](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/regislebrun/32/154_2.png) [@regislebrun](https://openturns.discourse.group/u/regislebrun)\ **Post date:** [May 26, 2023, 3:44pm UTC](https://openturns.discourse.group/t/plotting-error-grid-b/291/2 "2023-05-26T15:44:38Z")
Hi, This bug is known, see > > > Trying to instantiate the Viewer() with a sample raises an error in line 299 of… viewer.py: \`ValueError: keyword grid\_b is not recognized; \` > > Commenting the line seems to solve the issue. and > > > The \`Viewer\` sometimes fails with an exception generated by the grid. > > The fo…llowing script works on my machine. It creates a \`Grid\` based on a function which has a vector output. > > \`\`\`python > import openturns as ot > import openturns.viewer as otv > import numpy as np > > t\_min = 1.e-10 > t\_max = 1.0 > n\_times = 100 > timeGrid = np.linspace(t\_min, t\_max, n\_times) > > g\_function = ot.SymbolicFunction(\["t"\], \["sin(10 \* t) \* t", "sin(1 / t) \* t"\]) > timeSample = ot.Sample.BuildFromPoint(timeGrid) > result = g\_function(timeSample) > > grid = ot.GridLayout(1, 2) > graph = ot.Graph("", "t (s)", "T (°C)", True) > curve = ot.Curve(timeSample, result\[:, 0\]) > graph.add(curve) > grid.setGraph(0, 0, graph) > graph = ot.Graph("", "t (s)", "c", True) > curve = ot.Curve(timeSample, result\[:, 1\]) > graph.add(curve) > grid.setGraph(0, 1, graph) > grid.setTitle("Frasil dynamics") > view = otv.View(grid, figure\_kw={"figsize": (7.0, 3.0)}) > \`\`\` > On my machine, I use Matplotlib 3.5.2 on top of Python 3.10. > But CircleCI uses Matplotlib version 3.7.0 and it fails: > \`\`\` > ValueError: keyword grid\_b is not recognized; valid keywords are \['size', 'width', 'color', etc.\] > \`\`\` > > On top of the error stack, there is the Viewer: > \`\`\` > File ~/project/AS-Frasil/viewer.py:295, in View.\_\_init\_\_(self, graph, pixelsize, figure, figure\_kw, axes, plot\_kw, axes\_kw, bar\_kw, pie\_kw, polygon\_kw, polygoncollection\_kw, contour\_kw, step\_kw, clabel\_kw, text\_kw, legend\_kw, add\_legend, square\_axes, \*\*kwargs) > 290 if (graph.getLogScale() == ot.GraphImplementation.LOGY) or ( > 291 graph.getLogScale() == ot.GraphImplementation.LOGXY > 292 ): > 293 self.\_ax\[0\].set\_yscale("log") > \--\> 295 self.\_ax\[0\].grid(b=graph.getGrid()) > 297 # use scientific notation on non-log axis > 298 axis\_mask = { > 299 ot.GraphImplementation.NONE: "both", > 300 ot.GraphImplementation.LOGX: "y", > 301 ot.GraphImplementation.LOGY: "x", > 302 ot.GraphImplementation.LOGXY: None, > 303 } > \`\`\` > I cannot reproduce the bug. However, my guess is that the faulty line is: > > https://github.com/openturns/openturns/blob/986ec5b95d30a9492ad6bb8da85fc97240c86608/python/src/viewer.py#L299 > > I cannot explain why there is a \`b = graph.getGrid()\` input argument to Matplotlib's \`grid\` function. In my opinion, this should be: > \`\`\`python > self.\_ax\[0\].grid(graph.getGrid()) > \`\`\` It has been fixed in OpenTURNS 1.21rc1, and if you can’t upgrade a workaround is to deactivate the grid in your graph before to send it to the viewer: ```auto myGraph.setGrid(False) ``` Cheers Régis ---
**Author:** ![PhilippIce](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/philippice/32/263_2.png) [@PhilippIce](https://openturns.discourse.group/u/PhilippIce)\ **Post date:** [May 30, 2023, 7:40am UTC](https://openturns.discourse.group/t/plotting-error-grid-b/291/3 "2023-05-30T07:40:49Z")
Hi Régis, Thank you very much, sorry, I should’ve checked the Github repo more carefully. Perfect, now everything looks fine! Best, Philipp