{
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{
"cell_type": "markdown",
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"metadata": {},
"source": [
"# hist023_THStack_simple\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Rene Brun \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:12 PM."
]
},
{
"cell_type": "code",
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"outputs": [],
"source": [
"auto hs = new THStack(\"hs\", \"Stacked 1D histograms\");"
]
},
{
"cell_type": "markdown",
"id": "58a8553d",
"metadata": {},
"source": [
"create three 1-d histograms"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "74aec120",
"metadata": {
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"execution": {
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"outputs": [],
"source": [
"auto h1st = new TH1F(\"h1st\", \"test hstack\", 100, -4, 4);\n",
"h1st->FillRandom(\"gaus\", 20000);\n",
"h1st->SetFillColor(kRed);\n",
"h1st->SetMarkerStyle(21);\n",
"h1st->SetMarkerColor(kRed);\n",
"hs->Add(h1st);\n",
"auto h2st = new TH1F(\"h2st\", \"test hstack\", 100, -4, 4);\n",
"h2st->FillRandom(\"gaus\", 15000);\n",
"h2st->SetFillColor(kBlue);\n",
"h2st->SetMarkerStyle(21);\n",
"h2st->SetMarkerColor(kBlue);\n",
"hs->Add(h2st);\n",
"auto h3st = new TH1F(\"h3st\", \"test hstack\", 100, -4, 4);\n",
"h3st->FillRandom(\"gaus\", 10000);\n",
"h3st->SetFillColor(kGreen);\n",
"h3st->SetMarkerStyle(21);\n",
"h3st->SetMarkerColor(kGreen);\n",
"hs->Add(h3st);\n",
"\n",
"auto cst = new TCanvas(\"cst\", \"stacked hists\", 10, 10, 700, 700);\n",
"cst->Divide(2, 2);"
]
},
{
"cell_type": "markdown",
"id": "e6c97315",
"metadata": {},
"source": [
"in top left pad, draw the stack with defaults"
]
},
{
"cell_type": "code",
"execution_count": 3,
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"outputs": [],
"source": [
"cst->cd(1);\n",
"hs->Draw();"
]
},
{
"cell_type": "markdown",
"id": "cb5e64b8",
"metadata": {},
"source": [
"in top right pad, draw the stack in non-stack mode\n",
"and errors option"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "2b1a0aa8",
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"outputs": [],
"source": [
"cst->cd(2);\n",
"gPad->SetGrid();\n",
"hs->Draw(\"nostack,e1p\");"
]
},
{
"cell_type": "markdown",
"id": "d3ab0fea",
"metadata": {},
"source": [
"in bottom left, draw in stack mode with \"lego1\" option"
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "049db95b",
"metadata": {
"collapsed": false,
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"outputs": [],
"source": [
"cst->cd(3);\n",
"gPad->SetFrameFillColor(17);\n",
"gPad->SetTheta(3.77);\n",
"gPad->SetPhi(2.9);\n",
"hs->Draw(\"lego1\");\n",
"\n",
"cst->cd(4);"
]
},
{
"cell_type": "markdown",
"id": "10896a5d",
"metadata": {},
"source": [
"create two 2-D histograms and draw them in stack mode"
]
},
{
"cell_type": "code",
"execution_count": 6,
"id": "30c24a04",
"metadata": {
"collapsed": false,
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}
},
"outputs": [],
"source": [
"gPad->SetFrameFillColor(17);\n",
"auto a = new THStack(\"a\", \"Stacked 2D histograms\");\n",
"auto f1 = new TF2(\"f1\", \"xygaus + xygaus(5) + xylandau(10)\", -4, 4, -4, 4);\n",
"Double_t params1[] = {130, -1.4, 1.8, 1.5, 1, 150, 2, 0.5, -2, 0.5, 3600, -2, 0.7, -3, 0.3};\n",
"f1->SetParameters(params1);\n",
"auto h2sta = new TH2F(\"h2sta\", \"h2sta\", 20, -4, 4, 20, -4, 4);\n",
"h2sta->SetFillColor(38);\n",
"h2sta->FillRandom(\"f1\", 4000);\n",
"auto f2 = new TF2(\"f2\", \"xygaus + xygaus(5)\", -4, 4, -4, 4);\n",
"Double_t params2[] = {100, -1.4, 1.9, 1.1, 2, 80, 2, 0.7, -2, 0.5};\n",
"f2->SetParameters(params2);\n",
"auto h2stb = new TH2F(\"h2stb\", \"h2stb\", 20, -4, 4, 20, -4, 4);\n",
"h2stb->SetFillColor(46);\n",
"h2stb->FillRandom(\"f2\", 3000);\n",
"a->Add(h2sta);\n",
"a->Add(h2stb);\n",
"a->Draw();"
]
},
{
"cell_type": "markdown",
"id": "c11c457d",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
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