问题:在Matplotlib中绘制多个直方图时,我无法将一个图与另一个图区分开
图像问题:** **次要问题:左侧标签'Count'部分不在图像中。为什么?
描述
我想绘制3个不同集合的直方图。每个集合都是一个0和1的数组。我想要每个的直方图,以便我可以检测数据集上的不平衡。
我将它们分开绘制,但我希望将它们一起绘制图形。
可以并排放置不同的图形,也可以,或者我甚至用谷歌搜索将其绘制为3D,但我不知道“阅读”或“看”图形并理解它是多么容易。
现在,我想在同一图形的每一侧绘制[train],[validation]和[test]条,如下所示:
PS:我的Google搜索没有返回我可以理解的任何代码。另外,我想知道是否有人检查即时消息对我的代码是否有任何疯狂。
非常感谢你们!
代码 :
def generate_histogram_from_array_of_labels(Y=[], labels=[], xLabel="Class/Label", yLabel="Count", title="Histogram of Trainset"):
plt.figure()
plt.clf()
colors = ["b", "r", "m", "w", "k", "g", "c", "y"]
information = []
for index in xrange(0, len(Y)):
y = Y[index]
if index > len(colors):
color = colors[0]
else:
color = colors[index]
if labels is None:
label = "?"
else:
if index < len(labels):
label = labels[index]
else:
label = "?"
unique, counts = np.unique(y, return_counts=True)
unique_count = np.empty(shape=(unique.shape[0], 2), dtype=np.uint32)
for x in xrange(0, unique.shape[0]):
unique_count[x, 0] = unique[x]
unique_count[x, 1] = counts[x]
information.append(unique_count)
# the histogram of the data
n, bins, patches = plt.hist(y, unique.shape[0], normed=False, facecolor=color, alpha=0.75, range=[np.min(unique), np.max(unique) + 1], label=label)
xticks_pos = [0.5 * patch.get_width() + patch.get_xy()[0] for patch in patches]
plt.xticks(xticks_pos, unique)
plt.xlabel(xLabel)
plt.ylabel(yLabel)
plt.title(title)
plt.grid(True)
plt.legend()
# plt.show()
string_of_graphic_image = cStringIO.StringIO()
plt.savefig(string_of_graphic_image, format='png')
string_of_graphic_image.seek(0)
return base64.b64encode(string_of_graphic_image.read()), information
编辑
遵循哈希码的答案,此新代码:
def generate_histogram_from_array_of_labels(Y=[], labels=[], xLabel="Class/Label", yLabel="Count", title="Histogram of Trainset"):
plt.figure()
plt.clf()
colors = ["b", "r", "m", "w", "k", "g", "c", "y"]
to_use_colors = []
information = []
for index in xrange(0, len(Y)):
y = Y[index]
if index > len(colors):
to_use_colors.append(colors[0])
else:
to_use_colors.append(colors[index])
unique, counts = np.unique(y, return_counts=True)
unique_count = np.empty(shape=(unique.shape[0], 2), dtype=np.uint32)
for x in xrange(0, unique.shape[0]):
unique_count[x, 0] = unique[x]
unique_count[x, 1] = counts[x]
information.append(unique_count)
unique, counts = np.unique(Y[0], return_counts=True)
histrange = [np.min(unique), np.max(unique) + 1]
# the histogram of the data
n, bins, patches = plt.hist(Y, 1000, normed=False, alpha=0.75, range=histrange, label=labels)
#xticks_pos = [0.5 * patch.get_width() + patch.get_xy()[0] for patch in patches]
#plt.xticks(xticks_pos, unique)
plt.xlabel(xLabel)
plt.ylabel(yLabel)
plt.title(title)
plt.grid(True)
plt.legend()
正在产生这个:
-新编辑:
def generate_histogram_from_array_of_labels(Y=[], labels=[], xLabel="Class/Label", yLabel="Count", title="Histogram of Trainset"):
plt.figure()
plt.clf()
information = []
for index in xrange(0, len(Y)):
y = Y[index]
unique, counts = np.unique(y, return_counts=True)
unique_count = np.empty(shape=(unique.shape[0], 2), dtype=np.uint32)
for x in xrange(0, unique.shape[0]):
unique_count[x, 0] = unique[x]
unique_count[x, 1] = counts[x]
information.append(unique_count)
n, bins, patches = plt.hist(Y, normed=False, alpha=0.75, label=labels)
plt.xticks((0.25, 0.75), (0, 1))
plt.xlabel(xLabel)
plt.ylabel(yLabel)
plt.title(title)
plt.grid(True)
plt.legend()
现在可以使用,但是左侧的标签有点超出范围,我想将条形图更好地居中...我该怎么做?
我尝试过,并提出了这个建议。您可以在代码中更改xticks位置。您要做的只是将一个元组传递给plt.hist
,难道不是更简单吧!?因此,假设您有两个0和1列表,那么您要做的是-
a = np.random.randint(2, size=1000)
b = np.random.randint(2, size=1000)
plt.hist((a, b), 2, label = ("data1", "data2"))
plt.legend()
plt.xticks((0.25, 0.75), (0, 1))
我尝试运行的确切代码(将垃圾箱数更改为2后)-
a = np.random.randint(2, size=1000)
b = np.random.randint(2, size=1000)
y = [a, b]
labels = ["data1", "data2"]
generate_histogram_from_array_of_labels(Y = y, labels = labels)
我得到了相同的结果...
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