在本模型中,我们演示了程序块enabled
和程序块triggered
在操作上的差异,这两个程序块决定了触发子系统的条件。演示以事件计数为例。
该模型包含一个脉冲发生器Pulse Generator
,在Sample based
模式下,它根据开关之间必须经过的指定离散仿真步数来控制信号参数。
接下来,信号会进入两个计数器:
- 一个是作为子系统实现的,其端口为
EnablePort
(输入端出现正信号时触发、
- 另一个是作为子系统
TriggerPort
实现的,当信号出现上升沿时触发。
两个计数器被触发后,输出信号都加一。但是,从颜色上我们可以看出,第二个计数器的触发时间 (Sample Time
) 是由TriggerPort
块的操作决定的,因此计数器块的颜色与系统中其他块(采样时间设为 0.01)的颜色不同。
通过该模型,我们可以研究不同子系统的执行控制块是如何工作的。让我们运行模型并分析结果。
Out[0]:
Dict{String, DataFrames.DataFrame} with 3 entries:
"Счетчик Enabled" => 226×2 DataFrame…
"Счетчик Triggered" => 226×2 DataFrame…
"Сигнал управления" => 226×2 DataFrame…
在第二幅图中,我们可以看到enabled
子系统的运行情况,其触发逻辑由EnablePort
定义。当子系统在控制端口上接收到正信号时,计数器在每个仿真周期内都会增加。当子系统被禁用时,它会返回信号的最后累积值。当恢复正控制信号时,输出将被重置--该行为由块配置集EnablePort
设置。
在第三幅图中,我们可以看到triggered
子系统的运行情况,其触发逻辑通过TriggerPort
设置。控制信号每上升一个边沿,计数器就递增 1。
为什么计数器会 "错过 "前两个上升沿?其电路中有一个块Unit Delay
,在第一次触发时返回 0。而该程序块的第一次触发并不是在t=0
,而是在登记第一个上升沿的时刻:
- 当模型启动时,控制信号最初位于
1
,没有上升脉冲、
- 当第一个边沿出现时,计数器第一次被触发并返回
0
、
- 当记录第二个边沿时(第三个脉冲),计数器将返回
1
。
在Engee中使用不同的子系统触发模式,可以组织离散或连续过程模拟的复杂混合场景。我们已经通过两个子系统执行修改器--EnablePort
和TriggerPort
看到了这一点,但Engee还有更多此类修改器,允许您设置更复杂的子系统条件,这些修改器可在基本程序块库的子系统面板中找到。
{"id": "c093ede7-2c8c-4a80-8466-b9501de85f7a", "data": [{"showlegend": true, "mode": "lines", "xaxis": "x", "colorbar": {"title": {"text": ""}}, "name": "y1", "zmin": null, "yaxis": "y", "legendgroup": "y1", "zmax": null, "line": {"color": "rgba(0, 154, 250, 1.000)", "shape": "linear", "dash": "solid", "width": 1}, "y": [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0], "type": "scatter", "x": [0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1, 1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19, 1.2, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28, 1.29, 1.3, 1.31, 1.32, 1.33, 1.34, 1.35, 1.36, 1.37, 1.38, 1.39, 1.4, 1.41, 1.42, 1.43, 1.44, 1.45, 1.46, 1.47, 1.48, 1.49, 1.5, 1.51, 1.52, 1.53, 1.54, 1.55, 1.56, 1.57, 1.58, 1.59, 1.6, 1.61, 1.62, 1.63, 1.64, 1.65, 1.66, 1.67, 1.68, 1.69, 1.7, 1.71, 1.72, 1.73, 1.74, 1.75, 1.76, 1.77, 1.78, 1.79, 1.8, 1.81, 1.82, 1.83, 1.84, 1.85, 1.86, 1.87, 1.88, 1.89, 1.9, 1.91, 1.92, 1.93, 1.94, 1.95, 1.96, 1.97, 1.98, 1.99, 2, 2.01, 2.02, 2.03, 2.04, 2.05, 2.06, 2.07, 2.08, 2.09, 2.1, 2.11, 2.12, 2.13, 2.14, 2.15, 2.16, 2.17, 2.18, 2.19, 2.2, 2.21, 2.22, 2.23, 2.24, 2.25], "zaxis": null, "z": null, "metadata": {"shouldEnableSmartZoom": false, "smartZoomParams": {"minCount": 25000, "maxCount": 226, "currentCount": 226}}}], "config": {"showlegend": true, "xaxis": {"showticklabels": true, "gridwidth": 0.5, "range": [-0.06750000000000012, 2.3175], "domain": [0.0658209390492855, 0.9934383202099738], "mirror": false, "tickangle": 0, "showline": true, "zeroline": false, "tickfont": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 11}, "zerolinecolor": "rgba(0, 0, 0, 1)", "anchor": "y", "visible": true, "ticks": "inside", "tickmode": "array", "linecolor": "rgba(0, 0, 0, 1)", "showgrid": true, "title": {"text": "", "font": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 15}}, "gridcolor": "rgba(0, 0, 0, 0.1)", "tickcolor": "rgb(0, 0, 0)", "type": "linear"}, "paper_bgcolor": "rgba(255, 255, 255, 1.000)", "annotations": [], "height": 400, "margin": {"l": 0, "b": 20, "r": 0, "t": 20}, "plot_bgcolor": "rgba(255, 255, 255, 1.000)", "yaxis": {"showticklabels": true, "gridwidth": 0.5, "range": [-0.030000000000000027, 1.03], "domain": [0.03762029746281716, 0.9901574803149606], "mirror": false, "tickangle": 0, "showline": true, "zeroline": false, "tickfont": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 11}, "zerolinecolor": "rgba(0, 0, 0, 1)", "anchor": "x", "visible": true, "ticks": "inside", "tickmode": "array", "linecolor": "rgba(0, 0, 0, 1)", "showgrid": true, "title": {"text": "", "font": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 15}}, "gridcolor": "rgba(0, 0, 0, 0.1)", "tickcolor": "rgb(0, 0, 0)", "type": "linear"}, "legend": {"yanchor": "auto", "xanchor": "auto", "bordercolor": "rgba(0, 0, 0, 1)", "bgcolor": "rgba(255, 255, 255, 1.000)", "borderwidth": 1, "tracegroupgap": 0, "y": 1, "font": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 11}, "title": {"font": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 15}, "text": ""}, "traceorder": "normal", "x": 1}, "width": 1104.84375}}
{"id": "d3796dd5-fe93-4ba4-b4b0-41c279455878", "data": [{"showlegend": true, "mode": "lines", "xaxis": "x", "colorbar": {"title": {"text": ""}}, "name": "y1", "zmin": null, "yaxis": "y", "legendgroup": "y1", "zmax": null, "line": {"color": "rgba(0, 154, 250, 1.000)", "shape": "linear", "dash": "solid", "width": 1}, "y": [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 19, 19, 19, 19, 19, 19], "type": "scatter", "x": [0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1, 1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19, 1.2, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28, 1.29, 1.3, 1.31, 1.32, 1.33, 1.34, 1.35, 1.36, 1.37, 1.38, 1.39, 1.4, 1.41, 1.42, 1.43, 1.44, 1.45, 1.46, 1.47, 1.48, 1.49, 1.5, 1.51, 1.52, 1.53, 1.54, 1.55, 1.56, 1.57, 1.58, 1.59, 1.6, 1.61, 1.62, 1.63, 1.64, 1.65, 1.66, 1.67, 1.68, 1.69, 1.7, 1.71, 1.72, 1.73, 1.74, 1.75, 1.76, 1.77, 1.78, 1.79, 1.8, 1.81, 1.82, 1.83, 1.84, 1.85, 1.86, 1.87, 1.88, 1.89, 1.9, 1.91, 1.92, 1.93, 1.94, 1.95, 1.96, 1.97, 1.98, 1.99, 2, 2.01, 2.02, 2.03, 2.04, 2.05, 2.06, 2.07, 2.08, 2.09, 2.1, 2.11, 2.12, 2.13, 2.14, 2.15, 2.16, 2.17, 2.18, 2.19, 2.2, 2.21, 2.22, 2.23, 2.24, 2.25], "zaxis": null, "z": null, "metadata": {"shouldEnableSmartZoom": false, "smartZoomParams": {"minCount": 25000, "maxCount": 226, "currentCount": 226}}}], "config": {"showlegend": true, "xaxis": {"showticklabels": true, "gridwidth": 0.5, "range": [-0.06750000000000012, 2.3175], "domain": [0.03619130941965587, 0.9934383202099738], "mirror": false, "tickangle": 0, "showline": true, "zeroline": false, "tickfont": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 11}, "zerolinecolor": "rgba(0, 0, 0, 1)", "anchor": "y", "visible": true, "ticks": "inside", "tickmode": "array", "linecolor": "rgba(0, 0, 0, 1)", "showgrid": true, "title": {"text": "", "font": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 15}}, "gridcolor": "rgba(0, 0, 0, 0.1)", "tickcolor": "rgb(0, 0, 0)", "type": "linear"}, "paper_bgcolor": "rgba(255, 255, 255, 1.000)", "annotations": [], "height": 400, "margin": {"l": 0, "b": 20, "r": 0, "t": 20}, "plot_bgcolor": "rgba(255, 255, 255, 1.000)", "yaxis": {"showticklabels": true, "gridwidth": 0.5, "range": [-0.5700000000000003, 19.57], "domain": [0.03762029746281716, 0.9901574803149606], "mirror": false, "tickangle": 0, "showline": true, "zeroline": false, "tickfont": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 11}, "zerolinecolor": "rgba(0, 0, 0, 1)", "anchor": "x", "visible": true, "ticks": "inside", "tickmode": "array", "linecolor": "rgba(0, 0, 0, 1)", "showgrid": true, "title": {"text": "", "font": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 15}}, "gridcolor": "rgba(0, 0, 0, 0.1)", "tickcolor": "rgb(0, 0, 0)", "type": "linear"}, "legend": {"yanchor": "auto", "xanchor": "auto", "bordercolor": "rgba(0, 0, 0, 1)", "bgcolor": "rgba(255, 255, 255, 1.000)", "borderwidth": 1, "tracegroupgap": 0, "y": 1, "font": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 11}, "title": {"font": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 15}, "text": ""}, "traceorder": "normal", "x": 1}, "width": 1104.84375}}
{"id": "dc1f2b45-0823-48e9-9967-76a78b3f4805", "data": [{"showlegend": true, "mode": "lines", "xaxis": "x", "colorbar": {"title": {"text": ""}}, "name": "y1", "zmin": null, "yaxis": "y", "legendgroup": "y1", "zmax": null, "line": {"color": "rgba(0, 154, 250, 1.000)", "shape": "linear", "dash": "solid", "width": 1}, "y": [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4], "type": "scatter", "x": [0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1, 1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19, 1.2, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28, 1.29, 1.3, 1.31, 1.32, 1.33, 1.34, 1.35, 1.36, 1.37, 1.38, 1.39, 1.4, 1.41, 1.42, 1.43, 1.44, 1.45, 1.46, 1.47, 1.48, 1.49, 1.5, 1.51, 1.52, 1.53, 1.54, 1.55, 1.56, 1.57, 1.58, 1.59, 1.6, 1.61, 1.62, 1.63, 1.64, 1.65, 1.66, 1.67, 1.68, 1.69, 1.7, 1.71, 1.72, 1.73, 1.74, 1.75, 1.76, 1.77, 1.78, 1.79, 1.8, 1.81, 1.82, 1.83, 1.84, 1.85, 1.86, 1.87, 1.88, 1.89, 1.9, 1.91, 1.92, 1.93, 1.94, 1.95, 1.96, 1.97, 1.98, 1.99, 2, 2.01, 2.02, 2.03, 2.04, 2.05, 2.06, 2.07, 2.08, 2.09, 2.1, 2.11, 2.12, 2.13, 2.14, 2.15, 2.16, 2.17, 2.18, 2.19, 2.2, 2.21, 2.22, 2.23, 2.24, 2.25], "zaxis": null, "z": null, "metadata": {"shouldEnableSmartZoom": false, "smartZoomParams": {"minCount": 25000, "maxCount": 226, "currentCount": 226}}}], "config": {"showlegend": true, "xaxis": {"showticklabels": true, "gridwidth": 0.5, "range": [-0.06750000000000012, 2.3175], "domain": [0.02137649460484106, 0.9934383202099737], "mirror": false, "tickangle": 0, "showline": true, "zeroline": false, "tickfont": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 11}, "zerolinecolor": "rgba(0, 0, 0, 1)", "anchor": "y", "visible": true, "ticks": "inside", "tickmode": "array", "linecolor": "rgba(0, 0, 0, 1)", "showgrid": true, "title": {"text": "", "font": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 15}}, "gridcolor": "rgba(0, 0, 0, 0.1)", "tickcolor": "rgb(0, 0, 0)", "type": "linear"}, "paper_bgcolor": "rgba(255, 255, 255, 1.000)", "annotations": [], "height": 400, "margin": {"l": 0, "b": 20, "r": 0, "t": 20}, "plot_bgcolor": "rgba(255, 255, 255, 1.000)", "yaxis": {"showticklabels": true, "gridwidth": 0.5, "range": [-0.1200000000000001, 4.12], "domain": [0.03762029746281716, 0.9901574803149606], "mirror": false, "tickangle": 0, "showline": true, "zeroline": false, "tickfont": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 11}, "zerolinecolor": "rgba(0, 0, 0, 1)", "anchor": "x", "visible": true, "ticks": "inside", "tickmode": "array", "linecolor": "rgba(0, 0, 0, 1)", "showgrid": true, "title": {"text": "", "font": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 15}}, "gridcolor": "rgba(0, 0, 0, 0.1)", "tickcolor": "rgb(0, 0, 0)", "type": "linear"}, "legend": {"yanchor": "auto", "xanchor": "auto", "bordercolor": "rgba(0, 0, 0, 1)", "bgcolor": "rgba(255, 255, 255, 1.000)", "borderwidth": 1, "tracegroupgap": 0, "y": 1, "font": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 11}, "title": {"font": {"color": "rgba(0, 0, 0, 1)", "family": "sans-serif", "size": 15}, "text": ""}, "traceorder": "normal", "x": 1}, "width": 1104.84375}}